KR20220104169A - Method and apparatus for unauthorized-based data transmission in a wireless communication system - Google Patents

Abstract

The present disclosure relates to a communication technique that converges a 5G communication system for supporting a higher data rate after a 4G system with IoT technology, and a system thereof. The present disclosure provides intelligent services (eg, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services, etc.) based on 5G communication technology and IoT-related technology. ) can be applied to A method performed by a terminal in a communication system is provided. The method includes receiving an SPS configuration including a semi-persistent scheduling (SPS) configuration index from a base station, checking at least one physical downlink shared channel (PDSCH) corresponding to the SPS configuration, and corresponding to the SPS configuration When the at least one PDSCH overlaps in time within the slot, identifying a PDSCH having the smallest SPS configuration index, from the at least one PDSCH, the PDSCH overlapping the PDSCH having the smallest SPS configuration index Excluding the PDSCH determining a PDSCH for data transmission based on the do it with

Description

Method and apparatus for unauthorized-based data transmission in a wireless communication system

The present disclosure relates to a method and apparatus for transmitting and receiving data on a grant-free basis in a wireless communication system. Specifically, the present disclosure relates to a method of transmitting data on a non-acknowledgment basis in downlink.

Efforts are being made to develop an improved 5G (5th generation) communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of the 4G (4th generation) communication system. For this reason, the 5G communication system or the pre-5G communication system is called a 4G network beyond (Beyond 4G Network) communication system or a long term evolution (LTE) system after (Post LTE) system.

In order to achieve a high data rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the very high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud radio access network: cloud RAN), an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway.

In addition, in the 5G system, the advanced coding modulation (ACM) methods FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), and advanced access technologies FBMC (Filter Bank Multi Carrier), NOMA (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

On the other hand, the Internet is evolving from a human-centered connection network where humans create and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers, etc. with IoT technology, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, in technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication), 5G communication technology is implemented by techniques such as beam forming, MIMO, and array antenna. there will be The application of a cloud radio access network (cloud RAN) as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

The 5G communication system is developing to provide various services, and as various services are provided, a method for efficiently providing these services is required. Accordingly, research on grant-free based communication is being actively conducted.

The present disclosure describes an embodiment of performing data transmission/reception based on non-approval for efficient use of radio resources. Aspects of the present disclosure address at least the above-mentioned problems and/or disadvantages and provide at least the advantages described below. Accordingly, an aspect of the present disclosure provides a method for a terminal to receive data on a non-approval basis when resources for transmitting non-approval-based data overlap in time.

According to one aspect of the disclosure, a method performed by a terminal in a communication system is provided. The method includes receiving an SPS configuration including a semi-persistent scheduling (SPS) configuration index from a base station, checking at least one physical downlink shared channel (PDSCH) corresponding to the SPS configuration, and corresponding to the SPS configuration When the at least one PDSCH overlaps in time within the slot, identifying a PDSCH having the smallest SPS configuration index, from the at least one PDSCH, the PDSCH overlapping the PDSCH having the smallest SPS configuration index Excluding the PDSCH determining a PDSCH for data transmission based on the do it with

Additional aspects will be set forth in part in the description that follows, and in part will be apparent from the description, or may be learned by practice of the presented embodiments.

According to one aspect of the disclosure, there is provided a method performed by a base station in a communication system. The method includes transmitting an SPS configuration including a semi-persistent scheduling (SPS) configuration index to the terminal, and receiving data from the terminal based on a physical downlink shared channel (PDSCH) for data transmission, The PDSCH for the data transmission includes a PDSCH having the smallest SPS configuration index, and the PDSCH overlapping the PDSCH having the smallest SPS configuration index is excluded from at least one PDSCH corresponding to the SPS configuration, and The at least one PDSCH is characterized in that it does not overlap a symbol indicated by the uplink in the slot.

According to another aspect of the disclosure, a terminal is provided in a communication system. The terminal is connected to the transceiver and the transceiver, receives the SPS configuration including the SPS (semi persistent scheduling) configuration index from the base station, and confirms at least one physical downlink shared channel (PDSCH) corresponding to the SPS configuration and, when the at least one PDSCH corresponding to the SPS configuration overlaps in time within a slot, a PDSCH having the smallest SPS configuration index is identified, and the PDSCH having the smallest SPS configuration index from the at least one PDSCH and a controller for determining a PDSCH for data transmission based on excluding a PDSCH overlapping with , and receiving data based on the determined PDSCH, wherein the at least one PDSCH includes a symbol indicated by an uplink in the slot; It is characterized in that it does not overlap.

According to another aspect of the disclosure, a base station is provided in a communication system. The base station is connected to the transceiver and the transceiver, and transmits an SPS configuration including a semi-persistent scheduling (SPS) configuration index to the terminal, and transmits data based on a physical downlink shared channel (PDSCH) for data transmission to the terminal a control unit for receiving the data from, wherein the PDSCH for data transmission includes a PDSCH having the smallest SPS configuration index, and the PDSCH overlapping the PDSCH having the smallest SPS configuration index corresponds to the SPS configuration at least It is excluded from one PDSCH, and the at least one PDSCH is characterized in that it does not overlap a symbol indicated by an uplink in a slot.

According to an embodiment of the present disclosure, radio resources can be efficiently used in non-approval-based data transmission, and various services can be efficiently provided to users according to priorities.

Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, taken in conjunction with the accompanying drawings, which discloses various embodiments of the invention.

These and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, wherein:
1 is a diagram illustrating a transmission structure of a time-frequency domain, which is a radio resource domain of a 5th generation (5G) or new radio (NR) system according to an embodiment of the present disclosure.
2 illustrates data for enhanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC), and massive machine type communications (mMTC) in a 5G or NR system according to an embodiment of the present disclosure in a time-frequency resource domain. It is a figure which shows an example of allocation.
3 is a diagram for explaining a grant-free transmission/reception operation according to an embodiment of the present disclosure.
4 is a diagram illustrating a method of configuring a semi-static HARQ-ACK (hybrid automatic repeat request acknowledgment) codebook in an NR system according to an embodiment of the present disclosure.
5 is a diagram illustrating a method of configuring a dynamic HARQ-ACK codebook in an NR system according to an embodiment of the present disclosure.
6 is a diagram illustrating a HARQ-ACK transmission process for downlink (DL) semi persistent scheduling (SPS) according to an embodiment of the present disclosure.
7 is a diagram illustrating a process in which a terminal transmits semi-static HARQ-ACK codebook-based HARQ-ACK information for downlink control information (DCI) indicating deactivation of a physical downlink shared channel (SPS PDSCH) according to an embodiment of the present disclosure; It is a block diagram.
8 is a block diagram illustrating a method for a UE to determine a dynamic HARQ-ACK codebook for SPS PDSCH reception according to an embodiment of the present disclosure.
9 is a block diagram illustrating a method of transmitting HARQ-ACK information according to a DL SPS transmission period of a UE according to an embodiment of the present disclosure.
10 is a diagram illustrating a DL SPS reception operation of a UE in a situation in which two or more DL SPSs overlap in time resources according to an embodiment of the present disclosure.
11 is a block diagram illustrating a reception operation of a terminal in a situation where two or more DL SPSs overlap in time resources according to an embodiment of the present disclosure.
12 is a block diagram illustrating a structure of a terminal capable of performing an embodiment of the present disclosure.
13 is a block diagram illustrating a structure of a base station capable of performing an embodiment of the present disclosure.
Throughout the drawings, like reference numbers may be understood to refer to like parts, components, and structures.

The following description is provided with reference to the accompanying drawings, which are provided to provide a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. Various specific details are included herein to aid understanding, but these may be considered exemplary only. Accordingly, those skilled in the art will recognize that various changes and modifications can be made in the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and configurations may be omitted for clarity and conciseness.

Terms and words used in the following description and claims are not limited to the literal meanings, and are merely used by the inventors to enable a clear and consistent understanding of the present invention. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present invention is provided for purposes of illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

The singular forms “a”, “an” and “the” are to be understood to include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” may include reference to one or more of such surfaces.

At this time, it will be understood that each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions. These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible for the instructions stored in the flowchart block(s) to produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s). The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in the blocks to occur out of order. For example, it is possible that two blocks shown in succession are actually performed substantially simultaneously, or that the blocks are sometimes performed in the reverse order according to the corresponding function.

At this time, the term '~ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and '~ unit' performs certain roles do. However, '-part' is not limited to software or hardware. '~' may be configured to reside in an addressable storage medium or may be configured to refresh one or more processors. Thus, as an example, '~' refers to components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card. Also, in an embodiment, '~ unit' may include one or more processors.

A wireless communication system, for example, 3GPP's High Speed Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced ( LTE-A), 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e, such as communication standards, are developed into a broadband wireless communication system that provides high-speed and high-quality packet data services. In addition, a communication standard of 5G or NR (New Radio) is being made as a 5G wireless communication system.

In a 5G or NR system, which is a representative example of a broadband wireless communication system, an Orthogonal Frequency Division Multiplexing (OFDM) scheme is adopted in a downlink (DL) and an uplink. More specifically, a CP-OFDM (Cyclic-Prefix OFDM) scheme is employed in the downlink, and a Discrete Fourier Transform Spreading OFDM (DFT-S-OFDM) scheme is employed in the uplink along with CP-OFDM. The uplink refers to a radio link through which the terminal transmits data or control signals to the base station, and the downlink refers to a radio link through which the base station transmits data or control signals to the user equipment. In such a multiple access method, each user's data or control information is separated by allocating and operating the time-frequency resources to which data or control information is to be transmitted for each user so that they do not overlap each other, that is, orthogonality is established. can make it happen

The 5G or NR system employs a Hybrid Automatic Repeat reQuest (HARQ) method for retransmitting the corresponding data in the physical layer when a decoding failure occurs in the initial transmission. In the HARQ scheme, when the receiver fails to correctly decode (decode) data, the receiver transmits information (Negative Acknowledgment, NACK) notifying the transmitter of decoding failure so that the transmitter can retransmit the data in the physical layer. The receiver combines the data retransmitted by the transmitter with the previously unsuccessful data to improve data reception performance. In addition, when the receiver correctly decodes data, the receiver may transmit information (Acknowledgement, ACK) informing the transmitter of decoding success so that the transmitter can transmit new data.

On the other hand, a new 5G communication NR (New Radio access technology) system is designed to allow various services to be multiplexed freely in time and frequency resources. etc. can be dynamically or freely allocated according to the needs of the corresponding service. Meanwhile, in the 5G or NR system, the types of supported services can be divided into categories such as Enhanced Mobile BroadBand (eMBB), Massive Machine Type Communications (mMTC), and Ultra-Reliable and Low-Latency Communications (URLLC). eMBB is a high-speed transmission of high-capacity data, mMTC is a service that minimizes terminal power and connects multiple terminals, and URLLC is a service that aims for high reliability and low latency. Different requirements may be applied according to the type of service applied to the terminal.

In the present disclosure, each term is a term defined in consideration of each function, which may vary according to the intention or custom of a user or an operator. Therefore, the definition should be made based on the content throughout this specification. Hereinafter, the base station, as a subject performing resource allocation of the terminal, is at least one of gNode B (gNB), eNode B (eNB), Node B, BS (Base Station), radio access unit, base station controller, or a node on the network. can The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Hereinafter, the present disclosure will take an NR system as an example, but the present disclosure is not limited thereto, and embodiments of the present disclosure may be applied to various communication systems having a similar technical background or channel shape. In addition, the embodiments of the present disclosure may be applied to other communication systems through some modifications within a range that does not significantly depart from the scope of the present disclosure as judged by a person having skilled technical knowledge.

In the present disclosure, the terms of a conventional physical channel and a signal may be used interchangeably with data or a control signal. For example, the PDSCH is a physical channel through which data is transmitted, but in the present disclosure, the PDSCH may be referred to as data. That is, PDSCH transmission/reception may be understood as data transmission/reception.

In the present disclosure, higher signaling (or higher signal, higher layer signal, and higher layer signaling may be mixed) from the base station to the terminal using the downlink data channel of the physical layer, or from the terminal to the uplink data channel of the physical layer It is a signal transmission method that is transmitted to the base station using

As research on a 5G communication system is in progress, various methods for scheduling communication with a terminal are being discussed. Accordingly, an efficient scheduling and data transmission/reception method in consideration of the characteristics of the 5G communication system is required. Accordingly, in order to provide a plurality of services to a user in a communication system, there is a need for a method and an apparatus using the same for providing each service within the same time period according to the characteristics of the corresponding service.

The terminal must receive separate control information from the base station in order to transmit or receive data to the base station. However, in the case of periodically generated traffic or a service type requiring low delay and/or high reliability, it may be possible to transmit or receive data without the separate control information. This transmission method is referred to as a data transmission method based on a configured grant (can be mixed with a configured grant, grant-free, or configured scheduling) in the present disclosure. The method of receiving or transmitting data after receiving the data transmission resource setting and related information set through the control information is called the first signal transmission/reception type, and a method of transmitting or receiving data based on information set in advance without control information may be referred to as a second signal transmission/reception type. For the second signal transmission/reception type, preset resource regions exist periodically, and these regions are configured only with higher-order signals, such as uplink type 1 grant (UL type 1 grant), higher-order signals and L1 signals (that is, downlink). There is an uplink type 2 grant (or semi-persistent scheduling, SPS), which is a method configured by a combination of downlink control information (DCI). In the case of the UL type 2 grant (or SPS), some information is determined based on an upper level signal, and other than that, whether actual data is transmitted is determined based on the L1 signal. Here, the L1 signal can be largely divided into a signal indicating activation of a resource set to a higher level and a signal indicating release of the activated resource again.

In the present disclosure, when the DL SPS transmission period has an aperiodic or is less than 1 slot, a method for determining a corresponding semi-static HARQ-ACK (hybrid automatic repeat request acknowledgment) codebook and a dynamic HARQ-ACK codebook, and HARQ-ACK information including the method of transmission.

1 is a diagram illustrating a transmission structure of a time-frequency domain, which is a radio resource domain of a 5G or NR system, according to an embodiment of the present disclosure.

Referring to FIG. 1 , in a radio resource domain, a horizontal axis indicates a time domain and a vertical axis indicates a frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, and N _symb OFDM symbols 102 are gathered to form one slot 106 . The length of the subframe may be defined as 1.0 ms, and the radio frame 114 may be defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may be composed of a total of N _BW subcarriers 104 . However, these specific numerical values may be variably applied depending on the system.

The basic unit of the time-frequency resource region is a resource element (RE) 112 and may be represented by an OFDM symbol index and a subcarrier index. A resource block (RB) 108 may be defined as N _RB consecutive subcarriers 110 in the frequency domain.

In general, the minimum transmission unit of data is an RB unit. In 5G or NR systems, in general, N _symb = 14, N _RB = 12, and N _BW may be proportional to the bandwidth of the system transmission band. The data rate increases in proportion to the number of RBs scheduled for the UE. In the 5G or NR system, in the case of an FDD system that divides downlink and uplink by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth represents an RF bandwidth corresponding to a system transmission bandwidth. Table 1 below shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the LTE system, which is the 4th generation wireless communication before the 5G or NR system. For example, an LTE system with a 10 MHz channel bandwidth has a transmission bandwidth of 50 RBs.

[Table 1]

In the 5G or NR system, a channel bandwidth wider than the channel bandwidth of LTE presented in Table 1 may be employed. Table 2 shows the correspondence between the system transmission bandwidth, the channel bandwidth, and the subcarrier spacing (SCS) in the 5G or NR system.

[Table 2]

In a 5G or NR system, scheduling information for downlink data or uplink data is transmitted from a base station to a terminal through downlink control information (DCI). DCI is defined according to various formats, and whether it is scheduling information for uplink data (UL grant) or scheduling information for downlink data (DL grant) according to each format, whether it is a compact DCI with a small size of control information , whether spatial multiplexing using multiple antennas is applied, whether DCI for power control, etc. may be indicated. For example, DCI format 1_1, which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information.

- Carrier indicator: indicates which frequency carrier is transmitted.

- DCI format indicator: This is an indicator for distinguishing whether the corresponding DCI is for downlink or uplink.

- Bandwidth part (BandWidth Part, hereinafter BWP) indicator: It indicates in which BWP is transmitted.

- Frequency domain resource allocation (frequency domain resource allocation): indicates an RB in the frequency domain allocated for data transmission. The resource to be expressed is determined according to the system bandwidth and resource allocation method.

- Time domain resource allocation (time domain resource allocation): indicates in which OFDM symbol of which slot the data-related channel is to be transmitted.

- VRB-to-PRB mapping: indicates how to map the virtual RB (Virtual RB, hereinafter VRB) index and the physical RB (Physical RB, hereinafter PRB) index.

- Modulation and coding scheme (hereinafter referred to as MCS): indicates a modulation scheme and a coding rate used for data transmission. That is, a coding rate value that can inform TBS (transport block size) and channel coding information along with information on whether it is quadrature phase shift keying (QPSK), quadrature amplitude modulation (16QAM), 64QAM, or 256QAM can be indicated. have.

- CBG transmission information (codeBlock group transmission information): indicates information on which CBG is transmitted when CBG retransmission is configured.

- HARQ process number (HARQ process number): indicates the process number of HARQ.

- New data indicator (new data indicator): indicates whether HARQ initial transmission or retransmission.

- Redundancy version: indicates a redundancy version of HARQ.

- PUCCH (physical uplink control channel) resource indicator (PUCCH resource indicator): indicates a PUCCH resource for transmitting ACK / NACK information for downlink data.

- PDSCH-to-HARQ feedback timing indicator (PDSCH-to-HARQ_feedback timing indicator): indicates a slot in which ACK/NACK information for downlink data is transmitted.

- Transmit power control (TPC) command for PUCCH: indicates a transmit power control command for PUCCH, which is an uplink control channel.

In the case of PUSCH transmission, time domain resource assignment may be transmitted by information about a slot in which the PUSCH is transmitted and the number of OFDM symbols L to which the PUSCH is mapped to the starting OFDM symbol position S in the corresponding slot. The aforementioned S may be a relative position from the start of the slot, L may be the number of consecutive OFDM symbols, and S and L may be determined from the Start and Length Indicator Value (SLIV) defined as follows. have.

If (L-1) ≤ 7 then

SLIV = 14*(L-1)+S

SLIV = 14*(L-1)+S

else

SLIV = 14*(14-L+1)+(14-1-S)

SLIV = 14*(14-L+1)+(14-1-S)

where 0 < L ≤ 14-S

In a 5G or NR system, a table including information on a SLIV value, a PUSCH mapping type, and a slot in which a PUSCH is transmitted in one row may be generally configured through RRC configuration. Thereafter, in the time domain resource allocation of DCI, by indicating an index value in a set table, the base station can deliver the SLIV value, the PUSCH mapping type, and information on the slot in which the PUSCH is transmitted to the terminal. This method also applies to PDSCH.

Specifically, when the base station indicates to the terminal the time resource allocation field index m included in the DCI for scheduling the PDSCH, this is DMRS Type A position information corresponding to m+1 in the table indicating the time domain resource allocation information, PDSCH mapping It informs the combination of type information, slot index K0, data resource start symbol S, and data resource allocation length L. As an example, Table 3 below is a table including PDSCH time domain resource allocation information based on normal cyclic prefix.

[Table 3]

In Table 3, dmrs-typeA-Position is a field indicating a symbol position at which DMRS is transmitted in one slot indicated by a system information block (SIB), which is one of the terminal common control information. Possible values for this field are 2 or 3. When the number of symbols constituting one slot is 14 in total and the first symbol index is 0, 2 means the third symbol and 3 means the fourth symbol. In Table 3, the PDSCH mapping type is information indicating the location of the DMRS in the scheduled data resource region. When the PDSCH mapping type is A, DMRS is always transmitted/received at the symbol position determined in dmrs-typeA-Position regardless of the allocated data time domain resource. When the PDSCH mapping type is B, the DMRS is always transmitted and received in the first symbol among the allocated data time domain resources. In other words, PDSCH mapping type B does not use dmrs-typeA-Position information.

In Table 1, K ₀ means an offset between a slot index to which a physical downlink control channel (PDCCH) through which DCI is transmitted belongs and a slot index to which a PDSCH or PUSCH scheduled in the corresponding DCI belongs. For example, when the slot index of the PDCCH is n, the slot index of the PDSCH or the PUSCH scheduled by the DCI of the PDCCH is n+K ₀ . In Table 3, S means a start symbol index of a data time domain resource within one slot. The range of possible S values is usually 0 to 13 on a Normal Cyclic Prefix basis. In Table 1, L means a data time domain resource interval length within one slot. Possible values of L range from 1 to 14.

In the 5G or NR system, PUSCH mapping types are defined as type A (type A) and type B (type B). In PUSCH mapping type A, the first OFDM symbol among DMRS OFDM symbols is located in the second or third OFDM symbol in the slot. In PUSCH mapping type B, the first OFDM symbol among DMRS OFDM symbols is located in the first OFDM symbol in the time domain resource allocated for PUSCH transmission. The above-described PUSCH time domain resource allocation method may be equally applicable to PDSCH time domain resource allocation.

DCI may be transmitted on a downlink physical control channel, PDCCH (or control information, hereinafter may be used interchangeably) through a channel coding and modulation process. In general, DCI is independently scrambled with a specific RNTI (radio network temporary identifier, or terminal identifier) for each terminal, a cyclic redundancy check (CRC) is added, channel-coded, and each is configured as an independent PDCCH and transmitted. The PDCCH is mapped to a control resource set (CORESET) configured for the UE and transmitted.

Downlink data may be transmitted on PDSCH, which is a physical channel for downlink data transmission. The PDSCH may be transmitted after the control channel transmission period, and scheduling information such as a specific mapping position and a modulation method in the frequency domain is determined based on DCI transmitted through the PDCCH.

Among the control information constituting DCI, the base station notifies the terminal of the modulation scheme applied to the PDSCH to be transmitted and the size (TBS) of the data to be transmitted through the MCS. In one embodiment, the MCS may consist of 5 bits or more or fewer bits. The TBS corresponds to the size before the channel coding for error correction is applied to data (transport block, TB) to be transmitted by the base station.

In the present disclosure, a transport block (TB) may include a MAC header, MAC CE, one or more MAC service data unit (SDU), and padding bits. Alternatively, TB may indicate a data unit or MAC Protocol Data Unit (PDU) that is transmitted from the MAC layer to the physical layer.

Modulation schemes supported by 5G or NR systems are QPSK, 16QAM, 64QAM, and 256QAM, and each modulation order (Q _m ) corresponds to 2, 4, 6, and 8. That is, in the case of QPSK modulation, 2 bits per symbol, in the case of 16QAM modulation, 4 bits per OFDM symbol, in the case of 64QAM modulation, 6 bits per symbol can be transmitted, and in the case of 256QAM modulation, 8 bits per symbol can be transmitted.

When the PDSCH is scheduled by the DCI, HARQ-ACK information indicating whether decoding for the PDSCH succeeds or fails is transmitted from the terminal to the base station through the PUCCH. This HARQ-ACK information is transmitted in the slot indicated by the PDSCH-to-HARQ feedback timing indicator included in the DCI for scheduling the PDSCH. As shown in 4, it is set by a higher layer signal. When the PDSCH-to-HARQ feedback timing indicator indicates k, the UE transmits HARQ-ACK information after k slots in slot n in which the PDSCH is transmitted, that is, in n+k slots.

[Table 4]

When the PDSCH-to-HARQ feedback timing indicator is not included in the DCI format 1_1 for scheduling the PDSCH, the UE transmits HARQ-ACK information in slot n+k according to the k value configured as higher layer signaling. . When the UE transmits the HARQ-ACK information on the PUCCH, it transmits it to the base station using the PUCCH resource determined based on the PUCCH resource indicator included in the DCI for scheduling the PDSCH. In this case, the ID of the PUCCH resource mapped to the PUCCH resource indicator may be set through higher layer signaling. It is a diagram showing an example of allocation in a resource area.

Referring to FIG. 2 , data for eMBB, URLLC, and mMTC may be allocated in the entire system frequency band 200 . When the eMBB data 201 and the mMTC data 209 are allocated in a specific frequency band and the URLLC data 203, 205, and 207 are generated and transmission is required, the transmitter transmits the eMBB data 201 and the mMTC data 209 ) may vacate the already allocated portion or transmit the URLLC data 203 , 205 , and 207 without transmission. Among the above-described services, since it is necessary to reduce delay time for URLLC, URLLC data may be allocated and transmitted to a part of a resource to which eMBB or mMTC data is allocated. When URLLC data is additionally allocated and transmitted in the resource to which the eMBB data is allocated, the eMBB data may not be transmitted in the overlapping time-frequency resource, and thus the transmission performance of the eMBB data may be lowered. That is, eMBB data transmission failure may occur due to URLLC allocation.

Embodiment 1, Grant-free transmission/reception method

3 is a diagram illustrating a grant-free transmission/reception operation according to an embodiment of the present disclosure.

There are a first signal transmission/reception type in which downlink data reception is performed according to information set only by an upper level signal from the base station, and a second signal transmission/reception type in which downlink data reception is performed according to transmission setting information indicated by an upper level signal and an L1 signal. Although the present disclosure mainly describes the terminal operation method for the second signal transmission/reception type, use is not excluded in the first signal transmission/reception type, and the method proposed in the present disclosure may be used also for the first signal transmission/reception type.

DL SPS means downlink semi-persistent scheduling, and may refer to both the first signal transmission/reception type and the second signal transmission/reception type, or only one of the two. In addition, the DL SPS is a method in which the base station periodically transmits/receives downlink data information to the terminal based on information set as upper signaling without scheduling specific downlink control information. The DL SPS can be applied to VoIP or a traffic situation that occurs periodically. Alternatively, resource configuration for the DL SPS may be periodic, but data actually generated may be aperiodic. In this case, since the terminal does not know whether actual data is generated from the periodically set resource, it may be possible to perform the following two types of operations.

- Method 1-1: For the periodically set DL SPS resource region, the UE transmits HARQ-ACK information to the base station for the uplink resource region corresponding to the corresponding resource region for the demodulation/decoding result of the received data

- Method 1-2: For the periodically set DL SPS resource region, when at least signal detection for DMRS or data is successfully performed, the UE corresponds to the demodulation/decoding result of the received data in an uplink corresponding to the resource region. Transmitting HARQ-ACK information to the base station for the resource region

- Method 1-3: When the UE succeeds in decoding/demodulating for the periodically set DL SPS resource region (ie, ACK is generated), the uplink resource region corresponding to the corresponding resource region for the demodulation/decoding result of the received data transmits HARQ-ACK information to the base station for

According to method 1-1, even if the base station does not actually transmit downlink data for the DL SPS resource region, the UE can always transmit HARQ-ACK information to the uplink resource region corresponding to the DL SPS resource region.

According to method 1-2, since the base station does not know when to transmit data to the DL SPS resource region, HARQ-ACK information is transmitted in a situation in which the terminal knows whether to transmit or receive data, such as when the terminal succeeds in DMRS detection or CRC detection succeeds. it may be possible to

According to method 1-3, only when the terminal succeeds in demodulating/decoding data, the HARQ-ACK information is transmitted to the uplink resource region corresponding to the corresponding DL SPS resource region.

Among the above-described methods, it may be possible for the terminal to always support only one or support two or more. It may be possible for the UE to select one of the above methods using the 3GPP standard or higher-order signals. For example, when the method 1-1 is indicated by the higher level signal, the UE may transmit HARQ-ACK information for the corresponding DL SPS based on the method 1-1.

Alternatively, it may be possible to select one method according to the DL SPS higher-order configuration information. For example, if the transmission period is n slots or more in the DL SPS higher-level configuration information, the terminal applies method 1-1, and vice versa, it may be possible for the terminal to apply method 1-3. In this example, the transmission period is taken as an example, but the method may be sufficiently applied to the applied MCS table, DMRS configuration information, resource configuration information, and the like.

The UE performs downlink data reception in a downlink resource region configured for higher signaling. It may be possible to perform activation (activation) or release (release) of the downlink resource region set by the higher level signaling by L1 signaling.

3 illustrates an operation for a DL SPS according to an embodiment of the present disclosure. The UE may receive one or more of the following DL SPS configuration information through a higher-order signal.

- Periodicity: DL SPS transmission period

- nrofHARQ-Processes: Number of HARQ processes set up for DL SPS

- n1PUCCH-AN: HARQ resource configuration information for DL SPS

- mcs-Table: MCS table setting information applied to DL SPS

In the present invention, all DL SPS configuration information may be configured for each Pcell or Scell, and may also be configured for each frequency band section (BWP). In addition, it may be possible to configure one or more DL SPSs for each BWP for each specific cell.

Referring to FIG. 3 , the UE may determine grant-free transmission/reception configuration information 300 through reception of a higher-order signal for DL SPS. The DL SPS may be able to transmit/receive data with respect to the resource region 308 set after receiving 302 a DCI indicating activation, and may not be able to transmit/receive data with respect to the resource region 306 before receiving the DCI. . In addition, the UE cannot receive data for the resource region 310 after receiving 304 DCI indicating release.

The UE may verify the DL SPS assignment PDCCH when both of the following two conditions are satisfied for SPS scheduling activation or release.

- Condition 1: When the CRC bit of the DCI format transmitted in the PDCCH is scrambled with the CS-RNTI set by higher signaling

- Condition 2: When the new data indicator (NDI) field for the activated transport block is set to 0

When some of the fields constituting the DCI format transmitted to the DL SPS assignment PDCCH are the same as those shown in [Table 5] or [Table 6], the UE says that the information in the DCI format is valid activation or effective release of the DL SPS. can judge For example, when the terminal detects the DCI format including the information shown in [Table 5], the terminal may determine that the DL SPS is activated. As another example, when the UE detects the DCI format including the information shown in [Table 6], the UE may determine that the DL SPS has been released.

Some of the fields constituting the DCI format transmitted to the DL SPS assignment PDCCH are [Table 5] (special field configuration information for activating DL SPS) or [Table 6] (special field configuration information for releasing DL SPS) If it is not the same as presented in , the UE may determine that the DCI format is detected as a mismatched CRC.

[Table 5]

[Table 6]

When the UE receives the PDSCH without receiving the PDCCH or receives the PDCCH indicating SPS PDSCH release, the UE may generate a corresponding HARQ-ACK information bit. In addition, at least in Rel-15 NR, the UE may not expect to transmit HARQ-ACK information(s) for reception of two or more SPS PDSCHs on one PUCCH resource. In other words, at least in Rel-15 NR, the UE may include only HARQ-ACK information for one SPS PDSCH reception in one PUCCH resource. DL SPS may also be configured in a primary Cell (PCell) and a secondary Cell (SCell). Parameters that can be set for DL SPS higher level signaling are as follows.

- Periodicity: Transmission period of DL SPS

- nrofHARQ-processes: The number of HARQ processes that can be configured for DL SPS

- n1PUCCH-AN: PUCCH HARQ resource for DL SPS, the base station sets the resource to PUCCH format 0 or 1

The above-mentioned [Table 5] to [Table 6] are possible fields in a situation where only one DL SPS can be set per cell and per BWP. A DCI field for activating (or releasing) each DL SPS resource in a situation in which a plurality of DL SPSs are configured for each cell and for each BWP may vary. The present disclosure provides a method for solving such a situation.

In the present disclosure, not all DCI formats described in [Table 5] and [Table 6] are used to activate or release the DL SPS resource, respectively. For example, DCI format 1_0 and DCI format 1_1 used to schedule the PDSCH are used for activating the DL SPS resource. For example, DCI format 1_0 used to schedule the PDSCH is used for releasing DL SPS resources.

Embodiment 2, HARQ-ACK codebook setting method

4 is a diagram illustrating a method of configuring a semi-static HARQ-ACK codebook in an NR system according to an embodiment of the present disclosure.

In a situation where the HARQ-ACK PUCCH that the UE can transmit in one slot is limited to one, when the UE receives a semi-static HARQ-ACK codebook higher configuration, the UE receives a PDSCH-to-HARQ_feedback in DCI format 1_0 or DCI format 1_1 Reports HARQ-ACK information for PDSCH reception or SPS PDSCH release in the HARQ-ACK codebook in the slot indicated by the value of the timing indicator. The UE reports the HARQ-ACK information bit value as NACK in the HARQ-ACK codebook in the slot not indicated by the PDSCH-to-HARQ_feedback timing indicator field in DCI format 1_0 or DCI format 1_1. If the UE reports only HARQ-ACK information for one SPS PDSCH release or one PDSCH reception in MA _{and C} cases for candidate PDSCH reception, the report indicates that the counter DACI field indicates 1 in the Pcell. When scheduled by DCI format 1_0 including information, the UE determines one HARQ-ACK codebook for the corresponding SPS PDSCH release or the corresponding PDSCH reception.

Otherwise, the HARQ-ACK codebook determination method according to the method described above follows.

Assuming that the set of PDSCH reception candidate cases in the serving cell c is MA _,c , MA _,c can be obtained by the following [pseudo-code 1] steps.

[Start pseudo-code 1]

- Step 1: Initialize j to 0 and M _A,c to the empty set. Initialize k, which is the HARQ-ACK transmission timing index, to 0.

-　　　　　 Step 2: Set R as a set of rows in a table including slot information to which PDSCH is mapped, start symbol information, number of symbols or length information. If the PDSCH-capable mapping symbol indicated by each value of R is set as the UL symbol according to the DL and UL configuration set in the upper level, the corresponding row is deleted from R.

- Step 3-1: If the UE can receive one unicast PDSCH in one slot, and R is not an empty set, one is added to the set M _A,c .

- Step 3-2: If the UE can receive more than one PDSCH for unicast in one slot, count the number of PDSCHs that can be assigned to different symbols in the calculated R, and add the corresponding number to MA _,c .

-　　　　　 Step 4: Start again from step 2 by increasing k by 1.

[end of pseudo-code 1]

Taking the above-described psudo-code 1 as an example of FIG. 4 , in order to perform HARQ-ACK PUCCH transmission in slot #k ( 408 ), PDSCH-to-HARQ-ACK timing that may indicate slot #k ( 408 ) All of these possible slot candidates are considered. Referring to FIG. 4 , slot#k is determined by a combination of PDSCH-to-HARQ-ACK timing that is possible only for PDSCHs scheduled in slot#n (402), slot#n+1 (404) and slot#n+2 (406). It is assumed at 408 that HARQ-ACK transmission is possible. In addition, the maximum number of schedulable PDSCHs for each slot is derived in consideration of time domain resource configuration information of each schedulable PDSCH in slots 402, 404, and 406 and information indicating whether a symbol in the slot is downlink or uplink. For example, assuming that maximum scheduling is possible for two PDSCHs in slot 402, three PDSCHs in slot 404, and two PDSCHs in slot 406, the maximum number of PDSCHs included in the HARQ-ACK codebook transmitted in slot 408 is the total it is 7 This is called the cardinality of the HARQ-ACK codebook.

In a specific slot, the step 3-2 is described through the following [Table 7] (Default PDSCH time domain resource allocation A for normal CP).

[Table 7]

Table 7 is a time resource allocation table in which the terminal operates as a default before the terminal receives time resource allocation with a separate RRC signal. For reference, the PDSCH time resource allocation value is determined by dmrs-TypeA-Position, which is a common RRC signal, in addition to separately indicating the row index value as RRC. In Table 7, the ending column and the order column are separately added values for convenience of explanation, and it may be possible that they do not actually exist. The meaning of the Ending column means the end symbol of a scheduled PDSCH, and the order column means a code position value located in a specific codebook in the semi-static HARQ-ACK codebook. The table is applied to time resource allocation applied in DCI format 1_0 of the common search region of the PDCCH. In order for the UE to determine the HARQ-ACK codebook by calculating the maximum number of non-overlapping PDSCHs within a specific slot, the UE performs the following steps.

* Step 1: Search for the PDSCH allocation value that ends first in the slot among all the rows of the PDSCH time resource allocation table. In Table 7, it can be seen that row index 14 ends first. Mark it as 1 in the order column. And other row indexes overlapping the corresponding row index 14 by at least one symbol are marked as 1x in the order column.

* Step 2: And, among the remaining row indices that are not displayed in the Order column, the first ending PDSCH allocation value is searched for. In Table 7, a row with a row index of 7 and a dmrs-TypeA-Position value of 3 corresponds to this. And other row indices overlapping the corresponding row index by at least one symbol are indicated as 2x in the order column.

* Step 3: Repeat step 2 and increase the order value. As an example, the PDSCH allocation value that ends first among the row indices not indicated in the order column in Table 7 is searched. In Table 7, a row with a row index of 6 and a dmrs-TypeA-Position value of 3 corresponds to this. And other row indices overlapping the corresponding row index by at least one symbol are marked as 3x in the order column.

* Step 4: When order is displayed in all row indices, it ends. And the size of the corresponding order is the maximum number of PDSCHs that can be scheduled without time overlap within the corresponding slot. Scheduling without time overlap means that different PDSCHs are scheduled by TDM.

In the order column of Table 7, the maximum value of order means the HARQ-ACK codebook size of the corresponding slot, and the order value means the HARQ-ACK codebook point at which the HARQ-ACK feedback bit for the corresponding scheduled PDSCH is located. For example, row index 16 of Table 7 means that it exists at the second code position in the size 3 semi-static HARQ-ACK codebook. The terminal transmitting the HARQ-ACK feedback is [pseudo-code 1] or [pseudo-code 2] steps when the set of PDSCH reception candidate cases (occasion for candidates PDSCH receptions) in the serving cell c is M _A,c . _{A and c} can be found. M _A,c may be used to determine the number of HARQ-ACK bits to be transmitted by the UE. Specifically, the HARQ-ACK codebook may be configured using the cardinality of the M _A,c set.

As another example, considerations for determining the semi-static HARQ-ACK codebook (or type 1 HARQ-ACK codebook) may be as follows.

associated with the active UL BWPa) on a set of slot timing values

associated with the active UL BWP

a) If the UE is configured to monitor PDCCH for DCI format 1_0 and is not configured to monitor PDCCH for DCI format 1_1 on serving cell c,

is provided by the slot timing values {1, 2, 3, 4, 5, 6, 7, 8} for DCI format 1_0

a) If the UE is configured to monitor PDCCH for DCI format 1_0 and is not configured to monitor PDCCH for DCI format 1_1 on serving cell c,

is provided by the slot timing values {1, 2, 3, 4, 5, 6, 7, 8} for DCI format 1_0

b) If the UE is configured to monitor PDCCH for DCI format 1_1 for serving cell c,

is provided by dl-DataToUL-ACK for DCI format 1_1

b) If the UE is configured to monitor PDCCH for DCI format 1_1 for serving cell c,

is provided by dl-DataToUL-ACK for DCI format 1_1

, start and length indicators SLIV, and PDSCH mapping types for PDSCH reception as described in [6, TS 38.214]b) on a set of row indexes R of a table that is provided either by a first set of row indexes of a table that is provided by PDSCH-TimeDomainResourceAllocationList in PDSCH-ConfigCommon or by Default PDSCH time domain resource allocation A [6, TS 38.214], or by the union of the first set of row indexes and a second set of row indexes, if provided by PDSCH-TimeDomainResourceAllocationList in PDSCH-Config , associated with the active DL BWP and defining respective sets of slot offsets

, start and length indicators SLIV , and PDSCH mapping types for PDSCH reception as described in [6, TS 38.214]

between the downlink SCS configuration

and the uplink SCS configuration

provided by subcarrierSpacing in BWP-Downlink and BWP-Uplink for the active DL BWP and the active UL BWP, respectivelyc) on the ratio

between the downlink SCS configuration

and the uplink SCS configuration

provided by subcarrierSpacing in BWP-Downlink and BWP-Uplink for the active DL BWP and the active UL BWP, respectively

d) if provided, on TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated as described in Subclause 11.1.

As another example, the pseudo-code for determining the HARQ-ACK codebook may be as follows.

[Start pseudo-code 2]

, the UE determines a set of

occasions for candidate PDSCH receptions or SPS PDSCH releases according to the following pseudo-code. A location in the Type-1 HARQ-ACK codebook for HARQ-ACK information corresponding to a SPS PDSCH release is same as for a corresponding SPS PDSCH reception. For the set of slot timing values

, the UE determines a set of

occasions for candidate PDSCH receptions or SPS PDSCH releases according to the following pseudo-code. A location in the Type-1 HARQ-ACK codebook for HARQ-ACK information corresponding to a SPS PDSCH release is same as for a corresponding SPS PDSCH reception.

[Exit pseudo-code 2]

In pseudo-code 2, the location of the HARQ-ACK codebook containing HARQ-ACK information for DCI indicating DL SPS release is based on the location at which the DL SPS PDSCH is received. For example, if the start symbol in which the DL SPS PDSCH is transmitted starts from the 4th OFDM symbol based on the slot and has a length of 5 symbols, the HARQ-ACK information including the DL SPS release indicating release of the corresponding SPS is as if It is assumed that a PDSCH having a length of 5 symbols starting from the 4th OFDM symbol of the slot in which the DL SPS release is transmitted is mapped, and HARQ-ACK information corresponding thereto is included in the control information indicating the DL SPS release PDSCH-to- It is determined through the HARQ-ACK timing indicator and the PUSCH resource indicator. As another example, if the start symbol in which the DL SPS PDSCH is transmitted starts from the 4th OFDM symbol based on the slot and has a length of 5 symbols, HARQ-ACK information including DL SPS release indicating release of the corresponding SPS is It is assumed that the PDSCH having a length of 5 symbols starting from the 4th OFDM symbol of the slot indicated by the TDRA (Time domain resource allocation) of DCI, which is a DL SPS release, is mapped, and the corresponding HARQ-ACK information is transmitted to the DL SPS release It is determined through the PDSCH-to-HARQ-ACK timing indicator and the PUSCH resource indicator included in the indicated control information.

5 is a diagram illustrating a method of configuring a dynamic HARQ-ACK codebook in an NR system according to an embodiment of the present disclosure.

Referring to FIG. 5, the UE is a PDSCH-to-HARQ_feedback timing value for PUCCH transmission of HARQ-ACK information in slot n for PDSCH reception or SPS PDSCH release, and transmission slot location information of PDSCH scheduled in DCI format 1_0 or 1_1 HARQ-ACK information transmitted in one PUCCH in the corresponding slot n is transmitted based on K0. Specifically, for transmitting the above-described HARQ-ACK information, the UE is based on the DAI included in the DCI indicating the PDSCH or SPS PDSCH release, and the HARQ-ACK codebook of the PUCCH transmitted in the slot determined by the PDSCH-to-HARQ_feedback timing and K0. to decide

The DAI is composed of Counter DAI and Total DAI. Counter DAI is information indicating the location of HARQ-ACK information corresponding to the PDSCH scheduled in DCI format 1_0 or DCI format 1_1 in the HARQ-ACK codebook. Specifically, the value of counter DAI in DCI format 1_0 or 1_1 informs the cumulative value of PDSCH reception or SPS PDSCH release scheduled by DCI format 1_0 or DCI format 1_1 in a specific cell c. The above-described cumulative value is set based on the PDCCH monitoring occasion and the serving cell in which the scheduled DCI exists.

Total DAI is a value indicating the size of the HARQ-ACK codebook. Specifically, the value of Total DAI means the total number of previously scheduled PDSCH or SPS PDSCH releases including a time point at which DCI is scheduled. And Total DAI is a parameter used when the HARQ-ACK information in the serving cell c also includes HARQ-ACK information for the PDSCH scheduled in another cell including the serving cell c in a carrier aggregation (CA) situation. In other words, there is no Total DAI parameter in a system operating with one cell.

An example of the operation of the DAI is shown in FIG. 5 . In FIG. 5, when the terminal transmits the HARQ-ACK codebook selected based on the DAI to the PUCCH 520 in the nth slot of the carrier 0 502 in a situation in which two carriers are configured, PDCCH monitoring configured for each carrier It shows the change in the values of Counter DAI (C-DAI) and Total DAI (T-DAI) indicated by DCI searched for each occasion. First, in the DCI searched for at m=0 (506), C-DAI and T-DAI indicate a value 512 of 1, respectively. The DCI searched for at m=1 (508) indicates a value 514 in which C-DAI and T-DAI are 2, respectively. In the DCI searched for in carrier 0 (c=0, 502) of m=2 (510), C-DAI indicates a value of 3 (516). In the DCI searched for in carrier 1 (c=1, 504) of m=2 (510), C-DAI indicates a value of 4 (518). At this time, when carriers 0 and 1 are scheduled on the same monitoring occasion, T-DAI is all indicated as 4.

4 and 5, the HARQ-ACK codebook determination is performed in a situation where only one PUCCH containing HARQ-ACK information is transmitted in one slot. This is called mode 1. As an example of a method in which one PUCCH transmission resource is determined within one slot, when PDSCHs scheduled in different DCIs are multiplexed into one HARQ-ACK codebook in the same slot and transmitted, the PUCCH resource selected for HARQ-ACK transmission is finally determined as the PUCCH resource indicated by the PUCCH resource field indicated in the DCI that scheduled the PDSCH. That is, the PUCCH resource indicated by the PUCCH resource field indicated in the DCI scheduled before the DCI is ignored.

The following description defines a method and apparatus for determining a HARQ-ACK codebook in a situation in which two or more PUCCHs containing HARQ-ACK information can be transmitted in one slot. This is called mode 2. The UE may be capable of operating only mode 1 (transmitting only one HARQ-ACK PUCCH in one slot) or mode 2 (transmitting one or more HARQ-ACK PUCCHs in one slot). Alternatively, the terminal supporting both mode 1 and mode 2 sets the base station to operate only in one mode by higher signaling, or mode 1 and mode 2 are implicitly determined by DCI format, RNTI, DCI specific field value, scrambling, etc. it may be possible For example, a PDSCH scheduled in DCI format A and HARQ-ACK information associated therewith are based on mode 1, and a PDSCH scheduled in DCI format B and HARQ-ACK information associated therewith are based on mode 2.

Whether the above-described HARQ-ACK codebook is semi-static in FIG. 4 or dynamic in FIG. 5 is determined by the RRC signal.

Embodiment 3, HARQ-ACK transmission method for DL SPS

6 is a diagram illustrating a HARQ-ACK transmission process for a DL SPS according to an embodiment of the present disclosure.

Referring to FIG. 6 , case 600 shows a situation in which the maximum receivable PDSCHs 602 , 604 , and 606 are mapped in slot k without overlapping in terms of time resources. For example, if the PDSCH-to-HARQ feedback timing indicator is not included in the DCI format for scheduling the PDSCH, the UE transmits HARQ-ACK information in the slot k+1 according to the l value set as higher layer signaling HARQ-ACK information (608) is sent. Accordingly, the size of the semi-static HARQ-ACK codebook of slot k+1 is equal to the maximum number of transmittable PDSCHs in slot k, and will be 3. In addition, when HARQ-ACK information is 1 bit for each PDSCH, the HARQ-ACK codebooks of 600 to 608 of FIG. 6 will consist of a total of 3 bits of [X, Y, Z], and X is HARQ- for PDSCH 602 ACK information, Y will be HARQ-ACK information for PDSCH 604, and Z will be HARQ-ACK information for PDSCH 606. If PDSCH reception is successful, the corresponding information will be mapped to ACK, otherwise it will be mapped to NACK. In addition, when the actual DCI does not schedule the corresponding PDSCH, the UE reports NACK. Specifically, the location of the HARQ-ACK codebook located according to the SLIV of the PDSCH that can be scheduled in DCI may vary, and may be determined by Table 7 or [pseudo code 1] or [pseudo code 2]. 610 of FIG. 6 shows HARQ-ACK transmission in a situation in which DL SPS is activated. In Rel-15 NR, the minimum period of the DL SPS is 10 ms, and in 610, since the length of one slot is 1 ms in the 15 kHz subcarrier interval, the SPS PDSCH 612 is transmitted in the slot n, and then the SPS PDSCH 616 in the slot n + 10 ) will be sent.

The HARQ-ACK information for each SPS PDSCH is an upper signal, and after the period for the SPS, HARQ-ACK transmission resource information, MCS table setting, and the number of HARQ processes are informed, the information contained in the DCI format indicating the activation of the corresponding SPS. It informs the frequency resource, the time resource, the MCS value, etc. For reference, a PUCCH resource through which HARQ-ACK information is transmitted may also be configured as a higher-order signal, and the PUCCH resource has the following properties.

- Hopping

- PUCCH format (start symbol, symbol length, etc.)

Here, the MCS table setting and HARQ-ACK transmission resource information may not exist. When HARQ-ACK transmission resource information is present, Rel-15 NR supports PUCCH format 0 or 1 that can transmit up to 2 bits. However, in a later release, PUCCH format 2, 3 or 4 of 2 bits or more can be sufficiently supported.

Since HARQ-ACK transmission resource information is included in the DL SPS upper signal configuration, the UE may be able to ignore the PUCCH resource indicator in the DCI format indicating DL SPS activation. Alternatively, there may be no PUCCH resource indicator field itself in the corresponding DCI format. On the other hand, when there is no HARQ-ACK transmission resource information in the DL SPS upper signal configuration, the UE transmits HARQ-ACK information corresponding to the DL SPS to the PUCCH resource determined in the PUCCH resource indicator of the DCI format for activating the DL SPS. In addition, the difference between the slot in which the SPS PDSCH is transmitted and the slot in which the corresponding HARQ-ACK information is transmitted is determined by the value indicated by the PDSCH to HARQ-ACK feedback timing indicator of the format of the DCI that activates the DL SPS or the indicator is If not, it follows the specific value set as the upper signal in advance. For example, as in 610 of FIG. 6 , if the PDSCH to HARQ-ACK feedback timing indicator is 2, HARQ-ACK information for the SPS PDSCH 612 transmitted in the slot n is the PUCCH 614 of the slot n+2. ) is transmitted through In addition, the PUCCH through which the corresponding HARQ-ACK information is transmitted may be set as an upper signal or the corresponding resource may be determined by the L1 signal indicating DL SPS activation. And, the position of the HARQ-ACK codebook for the SPS PDSCH 612 transmitted to the PUCCH 614 is if up to three PDSCHs are receivable like 600 in FIG. In the case of [X Y Z], it is located at the Y-th position.

If a DCI indicating DL SPS release is transmitted, the UE needs to transmit HARQ-ACK information for the DCI to the base station. However, in the case of a semi-static HARQ-ACK codebook, the size of the HARQ-ACK codebook and its position are, as described above in this disclosure, between the time resource region to which the PDSCH is allocated and the PDSCH and HARQ-ACK indicated by the L1 signal or the higher signal. It is determined by the slot interval (PDSCH to HARQ-ACK feedback timing). Therefore, when the DCI indicating DL SPS release is transmitted to the semi-static HARQ-ACK codebook, a specific rule is required rather than arbitrarily determining a location in the HARQ-ACK codebook, and in Rel-15 NR, HARQ for DCI indicating DL SPS release - The location of the ACK information is mapped identically to the transmission resource region of the corresponding DL SPS PDSCH. As an example, 620 of FIG. 6 shows a situation in which a DCI 622 indicating release of an activated DL SPS PDSCH is transmitted in slot n. When the PDSCH to HARQ-ACK feedback timing indicator included in the corresponding DCI 622 format indicates 2, HARQ-ACK information for the corresponding DCI 622 will be transmitted to the PUCCH 623 of slot n + 2, The location of the HARQ-ACK codebook is as if a preset SPS PDSCH was scheduled in slot n, and the HARQ-ACK information for the DCI 622 indicating release of the DL SPS at the HARQ-ACK codebook location corresponding to the SPS PDSCH is transmitted to the terminal. This is mapped and transmitted. In this regard, the following two methods are possible, and the base station and the terminal will transmit/receive the corresponding DCI in at least one method according to the standard or the base station setting.

* Method 2-1-1: DCI transmission indicating release of DL SPS only in a slot in which a preset SPS PDSCH is to be transmitted

For example, as in 620 of FIG. 6 , if the SPS PDSCH is configured to be transmitted in the slot n, the UE transmits the DCI 622 indicating release of the SPS PDSCH only in the slot n, and the HARQ-ACK information for this is transmitted. Assuming that the SPS PDSCH is transmitted, it is the same as the determined slot position. In other words, when the slot in which the HARQ-ACK information for the SPS PDSCH is transmitted is n+2, the slot in which the HARQ-ACK information for the DCI indicating release of the DL SPS PDSCH is also transmitted is also n+2.

* Method 2-1-2: DCI transmission indicating release of DL SPS in any slot regardless of the slot in which the SPS PDSCH is transmitted

For example, as in 620 of FIG. 6 , when the SPS PDSCH is transmitted in slots n, n+10, n+20, ..., the base station transmits the DCI 624 indicating release of the corresponding DL SPS PDSCH to the slot n When transmitted in +3 and the value indicated in the PDSCH to HARQ-ACK feedback timing indicator included in the DCI is 1 or there is no corresponding field, when the value preset as the upper signal is 1, DL SPS PDSCH release is indicated HARQ-ACK information 626 for DCI is transmitted and received in slot n+4.

There may be a case in which the minimum period of the DL SPS is shorter than 10 ms. For example, if there is data that requires high reliability and low latency wirelessly from different devices in a factory, and the data transmission period is constant and the period itself is short, it should be shorter than the current 10ms. Accordingly, the DL SPS transmission period may be determined in units of slots, symbols, or symbol groups regardless of subcarrier intervals other than ms units. For reference, the minimum transmission period of the uplink configured grant PUSCH resource is 2 symbols.

630 of FIG. 6 shows a situation in which the transmission period of the DL SPS is 7 symbols smaller than the slot. Since the transmission period is within one slot, a maximum of two SPS PDSCHs 632 and 634 may be transmitted in slot k. And the HARQ-ACK information corresponding to the SPS PDSCH 632 and the SPS PDSCH 634 is a value indicated by the PDSCH to HARQ-ACK feedback timing indicator included in the DCI indicating SPS activation or if there is no corresponding field, prior It is transmitted in a slot according to the value set as the upper signal, for example, when the value is i, the terminal HARQ-ACK information 636 for the SPS PDSCH 632 and the SPS PDSCH 634 in the slot k + i (636) to send The location of the HARQ-ACK codebook included in the HARQ-ACK information should consider not only the TDRA, which is the time resource information for which the SPS PDSCH is scheduled, but also the transmission period. In the past, since only one SPS PDSCH could be transmitted per slot, the HARQ-ACK codebook position was determined based on TDRA, which is time resource information, without considering the transmission period. However, if the DL SPS transmission period is smaller than the slot, the HARQ-ACK codebook position is In order to determine it, TDRA, which is time resource information, and a transmission period should be considered together. Here, TDRA is Time Domain Resource Allocation, and includes transmission start symbol and length information of the SPS PDSCH. As an example, when the start symbol of the DL SPS PDSCH determined by the TDRA is 2 and the length is 3 in which the DL SPS transmission period is 7 symbols, there will be two DL SPS PDSCHs in one slot as shown in 630 of FIG. 6 . That is, the first SPS PDSCH 632 is a PDSCH having OFDM symbol indices 2, 3, and 4 determined in TDRA, and the second SPS PDSCH 634 is OFDM symbol indexes 9, 10, It is a PDSCH with 11. That is, the second SPS PDSCH in the slot has the same length as the first SPS PDSCH, but the offset is shifted by the transmission period. In summary, for quasi-static HARQ-ACK codebook generation or determination, the UE uses time resource allocation information when the SPS PDSCH transmission period is greater than 1 slot for HARQ-ACK codebook positioning for the SPS PDSCH in one slot. , when the SPS PDSCH transmission period is less than 1 slot, the time resource allocation information and the SPS PDSCH transmission period are considered together. For example, case 640 illustrated in FIG. 6 represents a situation in which DCI 642 indicating release of DL SPS PDSCH is transmitted in slot k. If the PDSCH-to-HARQ-ACK feedback timing indicator included in the format of the DCI 642 indicates j, HARQ-ACK information for the DCI 642 may be transmitted through the PUCCH 644 in slot k + j. have.

When the SPS PDSCH transmission period is less than 1 slot, the case where the SPS PDSCH spans a slot boundary may occur according to a combination of the transmission period and TDRA. 650 of FIG. 6 shows a corresponding example. In this case, the base station sets one SPS PDSCH crossing the slot boundary into a PDSCH 652 and a PDSCH 654 for repeated transmission. In this case, the PDSCH 652 and the PDSCH 654 may always have the same length or different lengths. In addition, only one HARQ-ACK information 656 for the SPS PDSCH composed of the PDSCH 652 and the PDSCH 654 is transmitted by the UE, and the corresponding reference slot is the last repeatedly transmitted PDSCH 654 transmitted Slot k Based on +1.

Example 3-1: Semi-static HARQ-ACK codebook mapping method for DCI indicating DL SPS release

When the transmission period of the SPS PDSCH becomes smaller than 1 slot, when the UE transmits HARQ-ACK information for DCI requesting release of the corresponding SPS PDSCH based on the semi-static HARQ-ACK codebook, the UE uses the following method HARQ-ACK codebook for the corresponding DCI is mapped by at least one of them.

* Method 2-2-1: The location of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating release of SPS PDSCH is the first SPS PDSCH located from the viewpoint of time resources among SPS PDSCHs received within one slot. Same as the location of the HARQ-ACK codebook for

- When the number of SPS PDSCHs in the slot in which the DCI indicating release of the SPS PDSCH is transmitted is two or more, the terminal is located in the semi-static HARQ-ACK codebook for HARQ-ACK information of the first SPS PDSCH in time, the HARQ for the DCI is - ACK information is mapped and transmitted.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. If corresponding HARQ-ACK information is mapped to two SPS PDSCHs at positions {2} and {3}, respectively, HARQ-ACK information indicating release of the DL SPS PDSCH is mapped to positions {2}.

* Method 2-2-2: The location of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating the release of SPS PDSCH is the SPS PDSCH located last among SPS PDSCHs received in one slot in terms of time resources. Same as the location of the HARQ-ACK codebook for

- When the number of SPS PDSCHs in the slot in which the DCI indicating the release of the SPS PDSCH is transmitted is two or more, the terminal is located in the semi-static HARQ-ACK codebook for HARQ-ACK information of the last SPS PDSCH in time, the HARQ for the DCI is - ACK information is mapped and transmitted.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. If corresponding HARQ-ACK information is mapped to two SPS PDSCHs at positions {2} and {3}, respectively, HARQ-ACK information indicating release of the DL SPS PDSCH is mapped to positions {3}.

* Method 2-2-3: The positions of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release are the positions of all HARQ-ACK codebooks for SPS PDSCHs received within one slot. same

- When the number of SPS PDSCHs in the slot in which the DCI indicating the release of the SPS PDSCH is transmitted is two or more, the terminal is located in the semi-static HARQ-ACK codebook positions for the HARQ-ACK information of all SPS PDSCHs. HARQ-ACK information for the corresponding DCI is repeatedly mapped and transmitted.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. If the corresponding HARQ-ACK information is mapped to two SPS PDSCHs at positions {2} and {3}, respectively, HARQ-ACK information indicating release of the DL SPS PDSCH is repeated at positions {2} and {3} mapped That is, the same HARQ-ACK information is mapped to positions {2} and {3}.

* Method 2-2-4: The position of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is among multiple HARQ-ACK codebook candidate positions for SPS PDSCHs received within one slot. One is selected by the base station as the upper signal or the L1 signal or a combination thereof

- When the number of SPS PDSCHs in the slot in which the DCI indicating the release of the SPS PDSCH is transmitted is two or more, the base station among the semi-static HARQ-ACK codebook positions for the HARQ-ACK information of the SPS PDSCHs uses an upper signal or an L1 signal or a combination thereof. One location is selected, and the terminal maps and transmits HARQ-ACK information for the corresponding DCI at the selected location.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. If the two SPS PDSCHs are respectively mapped with corresponding HARQ-ACK information at positions {2} and {3}, the base station selects {2} using DCI indicating release of the DL SPS PDSCH, and the terminal HARQ-ACK information indicating release of DL SPS PDSCH is mapped to position {2} and transmitted. As a DCI field for determining the semi-static HARQ-ACK codebook position, a time resource allocation field, a HARQ process number, or a PDSCH-to-HARQ feedback timing indicator may be utilized. For example, the time resource allocation field in the DCI indicating the release of the SPS PDSCH indicates time resource information of one SPS PDSCH among SPS PDSCHs that can be transmitted in the corresponding slot, and the terminal indicates the level corresponding to the indicated SPS PDSCH. HARQ-ACK information of the corresponding DCI may be transmitted to the static HARQ-ACK codebook position.

* Method 2-2-5: The location of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is indicated or configured by the base station by the upper signal or L1 signal or a combination thereof

- When the maximum number of receivable PDSCHs without time overlap is two or more in the slot in which the DCI indicating the release of the SPS PDSCH is transmitted, the base station among the semi-static HARQ-ACK codebook positions for the HARQ-ACK information of the corresponding PDSCHs is an upper signal or L1 One position is selected by a signal or a combination thereof, and the UE maps and transmits HARQ-ACK information for the corresponding DCI at the selected position.

- The set of quasi-static HARQ-ACK codebook positions that the base station can select by Method 2-2-4 consists of quasi-static HARQ-ACK codebook positions to which HARQ-ACK information of the SPS PDSCH can be mapped, Method 2- The set of quasi-static HARQ-ACK codebook positions that the base station can select by 2-5 consists of quasi-static HARQ-ACK codebook positions to which HARQ-ACK information of all PDSCHs can be mapped.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. The base station selects {1} by using the DCI indicating release of the DL SPS PDSCH, and the terminal maps HARQ-ACK information instructing the release of the DL SPS PDSCH to position {1} and transmits. As a DCI field for determining the semi-static HARQ-ACK codebook position, a time resource allocation field, a HARQ process number, or a PDSCH-to-HARQ feedback timing indicator may be utilized. For example, the time resource allocation field in the DCI indicating the release of the SPS PDSCH indicates time resource information of one PDSCH among PDSCHs that can be transmitted in the corresponding slot, and the UE indicates a semi-static HARQ-ACK corresponding to the indicated PDSCH. Transmits HARQ-ACK information of the corresponding DCI to the codebook location.

The above-described methods may be possible in a situation in which only one HARQ-ACK transmission is supported in one slot. When the code block group (CBG)-based transmission is set to a higher level through the DL SPS PDSCH, the UE repeats the HARQ-ACK information for the DCI indicating the release of the DL SPS PDSCH by the number of CBGs by repeating at least one of the above methods It can be transmitted by mapping to a semi-static HARQ-ACK codebook resource determined by one. Although the above-described method has been described as a method of transmitting HARQ-ACK information for DL SPS PDSCH indicating release of one SPS PDSCH transmission/reception, DL indicating simultaneous release of two or more activated PDSCH transmission/reception in one cell/one BWP HARQ-ACK information transmission method for the SPS PDSCH may be sufficiently possible without any addition or subtraction. As an example, when a DL SPS PDSCH release signal is related to a plurality of SPS PDSCHs activated in one cell/one BWP, the SPS PDSCHs considered for HARQ-ACK codebook location selection belong to a representative configuration or all It may be SPS PDSCHs belonging to the configuration. At this time, if it belongs to the representative configuration, the representative configuration may be the SPS PDSCH configuration number with the lowest index or the first activated SPS PDSCH configuration. This is only an example, and other similar methods may be sufficiently possible.

Embodiment 3-2: Dynamic HARQ-ACK codebook mapping method for multiple SPS PDSCHs transmitted in one slot

In the dynamic HARQ-ACK codebook (or Type 2 HARQ-ACK codebook), the location of corresponding HARQ-ACK information is basically determined by Total DAI and Counter DAI included in DCI for scheduling PDSCH. Total DAI informs the size of the HARQ-ACK codebook transmitted in slot n, and Counter DAI informs the location of the HARQ-ACK codebook transmitted in slot n. Next, the dynamic HARQ-ACK codebook in Rel-15 NR is set by [pseudo-code 3].

[Start pseudo-code 3]

[Exit pseudo-code 3]

[pseudo-code 3] is applied when the transmission period of the SPS PDSCH is greater than 1 slot, and when the transmission period of the SPS PDSCH is less than 1 slot, the dynamic HARQ-ACK codebook is determined by the following [pseudo-code 4]. will be. Alternatively, [pseudo-code 4] may be generally applied regardless of the SPS PDSCH transmission period or the number of SPS PDSCHs activated in one cell/one BWP.

[Start pseudo-code 4]

[Exit pseudo-code 4]

In the above-mentioned [pseudo-code 4], the value k, which is the number of SPS PDSCHs in one slot, corresponds only to one SPS PDSCH configuration in one cell/one BWP, or when multiple SPS PDSCH configurations are possible in one cell/one BWP , may include all SPS PDSCH configurations.

The [pseudo-code 3] or [pseudo-code 4] may be applied in a situation where HARQ-ACK information transmission is limited to at most one per slot.

Embodiment 3-3: Individual HARQ-ACK transmission method for multiple SPS PDSCHs transmitted in one slot

When the UE receives a DL SPS transmission period smaller than 1 slot and a higher-order signal to transmit only one HARQ-ACK per slot, the DL SPS PDSCH 632 and DL SPS PDSCH received in slot k as shown in 630 of FIG. 6 . HARQ-ACK information for (634) is transmitted to the PUCCH of the slot k+i indicated in advance by the upper signal or the L1 signal or a combination thereof. As an example, the terminal determines the granularity of the PDSCH to HARQ-ACK timing indicator in the DCI format indicating DL SPS activation at the slot level, and the base station determines the slot index in which the DL SPS PDSCH is received and the slot in which the HARQ-ACK information is transmitted. The difference value from the index is provided to the terminal, and the PUCCH resource through which HARQ-ACK information is transmitted in the slot indicated by L1 is set to the terminal as a higher-order signal. 630 of FIG. 6 shows a situation in which the PDSCH to HARQ-ACK timing indicates the value of i. The corresponding value may be directly selected as the L1 signal, or candidate values may be set as an upper signal, and it may be possible to select one of these values as the L1 signal.

When a terminal or a base station wants to separately transmit/receive HARQ-ACK information for DL SPS PDSCHs that are individually transmitted/received, the base station has a DL SPS transmission period smaller than one slot and a higher level so that two or more HARQ-ACKs can be transmitted per slot. signal can be set. For example, as in 660 of FIG. 6 , the UE transmits HARQ-ACK information for the SPS PDSCH 662 received in slot k through the PUCCH 666 in slot k+i, and HARQ- for the SPS PDSCH 664 . ACK information may be transmitted through the PUCCH 668 in slot k+i. To enable this, as an example, the UE determines the granularity for the PDSCH to HARQ-ACK timing indicator in the DCI format indicating DL SPS activation at the symbol level, and the corresponding value is the transmission end symbol (or transmission start symbol) of the SPS PDSCH. ) to the total symbol length from the transmission start symbol (or the transmission end symbol) of the PUCCH in which the corresponding HARQ-ACK information is transmitted. In 660 of FIG. 6, the end symbol of the SPS PDSCH 662 is s0, and the start symbol of the PUCCH 666 in which HARQ-ACK information for the SPS PDSCH 662 is transmitted is s1. A value indicated by “s1-s0” may be directly selected by the L1 signal, or candidate values are set as an upper signal, and it may be possible to determine one of these values as the L1 signal. Through the information, the UE can determine the start symbol of the PUCCH to which the HARQ-ACK information for the SPS PDSCH will be transmitted. Other PUCCH transmission information may be determined as a higher-order signal, an L1 signal, or a combination thereof. If the PUCCH resource indicator in the L1 or higher signal of Rel-15 is used, the terminal may determine that the "starting symbol index" field among the values indicated in the corresponding indicator is not used. Alternatively, since the starting symbol for separately transmitting HARQ-ACK information has already been provided through the PDSCH to HARQ-ACK timing indicator information, a new higher-order signal without a corresponding field or a signal composed of an L1 signal or a combination thereof may be provided to the UE. have. In summary, the UE may differently interpret the PDSCH to HARQ-ACK timing indicator field included in the DCI indicating activation of the SPS PDSCH according to the SPS PDSCH transmission period as follows.

- Method 2-3-1: Judging by slot level

- For example, when the transmission period of the SPS PDSCH is greater than 1 slot, the UE determines the granularity of the PDSCH to HARQ-ACK timing indicator as the slot level.

- Method 2-3-2: Judging by symbol level

- For example, when the transmission period of the SPS PDSCH is less than 1 slot, the UE determines the granularity of the PDSCH to HARQ-ACK timing indicator as a symbol level.

Embodiment 3-4: DL SPS/CG period change method for aperiodic traffic

The transmission period of the DL SPS supported by the base station may be a unit of a slot level or a symbol level. If information sensitive to the delay time of equipment operated in the factory is periodically generated and the period is not a value or multiple of the standard supported by the 3GPP standard organization, the base station can set an effective DL SPS transmission period. there will be no For example, when there is a traffic pattern having a 2.5 symbol interval, the base station may not be able to allocate only a DL SPS having a transmission period of 2 symbols or 3 symbols. Accordingly, there is a need to introduce a signal for setting a DL SPS transmission period having aperiodicity or dynamically changing the transmission period. It is possible for the terminal to dynamically change the transmission period by at least one of the following methods.

* Method 2-4-1: DL SPS transmission period allocation method with aperiodic

- The base station may be able to set the DL SPS transmission period in a bitmap manner. For example, when bitmap information composed of 10 bits exists as a higher-order signal, 1 is DL SPS transmission and 0 is DL SPS non-transmission. Even if not, it will be possible to create a DL SPS transmission period of various patterns. In addition, the pattern may be repeated in units of 10 slots. Alternatively, a bitmap size and a section indicated by a corresponding bit may be a slot, a symbol, or a symbol group. It may be possible to independently set the corresponding information as a higher-order signal or to vary the range of the transmission period that each bit can indicate according to the size of the bitmap. For example, when the size of the bitmap is 20, the time range indicated by each bit is in units of 7 symbols, and when the size of the bitmap is 10, the time range indicated by each bit is in units of slots.

- Alternatively, it will be possible for the base station to set two or more DL SPS transmission periods with a higher-order signal in advance, and to set a time difference for each consecutively transmitted DL SPS as a pattern. For example, it may be possible to determine a DL SPS transmission period having a 2-symbol interval and a 3-symbol interval for a 2.5-symbol traffic pattern. The following Table 8 is a table regarding the setting of the aperiodic DL SPS transmission period. Z is a prime number with values up to the first decimal place, and has a relationship of X<Z<X+1. For example, when Z is 3.2, X has a value of 3. Gap 1 means a symbol interval between the first SPS PDSCH resource received by the UE and the second SPS PDSCH resource thereafter after receiving the DCI indicating SPS activation. Gap 2 means a symbol interval between the second SPS PDSCH resource and the third SPS PDSCH resource thereafter. That is, Gap i means a symbol interval between the i-th SPS PDSCH resource and the i+1-th SPS PDSCH resource thereafter. Configuration is a parameter for selecting one of various patterns, and Table 8 shows a configuration with a total of 9 patterns. The corresponding parameter is provided to the UE by a higher-order signal or an L1 signal, and the UE can determine the DL SPS PDSCH transmission period pattern by the value indicated by the corresponding parameter. As another example, it may be possible that a value of one of the configurations is implicitly determined according to a value of a traffic generation period. For example, if the base station and the terminal transmit/receive the corresponding information by setting the 2.3 symbol traffic pattern and the corresponding pattern by the upper signal setting, the base station and the terminal may determine that configuration 3 is applied.

[Table 8]

* Method 2-4-2: How to change the dynamic DL SPS transmission period

- Method 2-4-2-1: Include transmission period information in DCI indicating DL SPS activation

In DCI, the DL SPS transmission period value is included in the information. As for the corresponding transmission period value, a set of candidate values is set as an upper signal in advance, and a specific value within the set is selected as DCI. For example, 1 bit is generated in the corresponding transmission period field in DCI in which the transmission period is set to {1 slot, 2 slots} with the upper signal, and 1 bit indicates whether the transmission period is 1 slot or 2 slots. That is, the number of DCI bits is determined according to the set of transmission periods set as the upper signal, and when the number of sets is N, a total of ceil(log ₂ (N)) bits are set in the DCI. The corresponding DCI corresponds to a non-fallback DCI such as DCI format 1_1, and even if a fallback DCI corresponding field such as DCI format 1_0 does not exist or exists, a fixed bit value and period values associated with each corresponding bit value may always be applied.

- Method 2-4-2-2: Utilize existing field in DCI format indicating DL SPS activation 1

When one field in the DCI format indicating DL SPS activation indicates a specific value, the value of the other field is used to indicate the transmission period instead of the previously indicated value. For example, when all bit values of the field indicating the HARQ process number indicate a value of "1", the field indicating the time resource information is a DL of one of the sets of DL SPS transmission periods in which the field indicating the time resource information is previously set as a higher signal. It can be used for the purpose of notifying the SPS transmission period.

- Method 2-4-2-3: Utilize existing field in DCI format indicating DL SPS activation 2

In the case of a DCI format indicating DL SPS activation, it may be possible that a specific field in the corresponding DCI format itself always indicates the transmission period or that a specific value among specific fields in the corresponding DCI format indicates the transmission period. For example, when the time resource allocation field of the DCI format is verified as a format indicating activation of the SPS PDSCH, the base station transmits the SPS PDSCH transmission period, which is not a value indicating the start symbol and length of the existing SPS PDSCH. It is judged to be used as a value indicating .

- Method 2-4-2-4: Search space-based implicit transmission period information setting

A transmission period value is dynamically changed according to a search space in which DCI indicating DL SPS activation is transmitted. For example, a DCI indicating DL SPS activation transmitted to the common search space has a transmission period A value, and a DCI indicating DL SPS activation transmitted to a UE specific search space has a transmission period B value. can judge The transmission period A and the transmission period B may be previously set by the terminal as a higher-order signal.

- Method 2-4-2-5: DCI format-based implicit transmission period information setting

The transmission period value is dynamically changed according to the DCI format indicating DL SPS activation. For example, a DCI indicating DL SPS activation transmitted in DCI format 1_0, which is a fallback DCI, has a transmission period A value, and a DCI indicating DL SPS activation transmitted in DCI format 1_1, which is a non-fallback DCI, has a transmission period B value. As having , the terminal can implicitly determine. The transmission period A and the transmission period B may be previously set by the terminal as a higher-order signal.

In the present disclosure, the UE does not expect to configure or receive DL SPS PDSCH time resource information beyond the transmission period of the DL SPS.

7 is a block diagram illustrating a process in which a UE transmits semi-static HARQ-ACK codebook-based HARQ-ACK information for DCI indicating SPS PDSCH deactivation according to an embodiment of the present disclosure.

The UE receives SPS PDSCH configuration information through higher layer signaling. In this case, the information set as the upper signal may include a transmission period, an MCS table, HARQ-ACK configuration information, and the like. After receiving the higher-order signal, the terminal receives (700) DCI for activating the SPS PDSCH from the base station. After receiving the DCI indicating the activation, the UE periodically receives the SPS PDSCH and transmits HARQ-ACK information corresponding thereto (702). Thereafter, when there is no more downlink data to be transmitted/received periodically, the base station transmits a DCI indicating SPS PDSCH deactivation to the terminal, and the terminal receives (704) it. The UE transmits (706) HARQ-ACK information for DCI indicating deactivation of the SPS PDSCH according to the SPS PDSCH transmission period. For example, when the transmission period is greater than 1 slot, the terminal transmits the HARQ-ACK information for DCI indicating deactivation of the SPS PDSCH in the HARQ-ACK codebook position for the HARQ-ACK information corresponding to the SPS PDSCH. do. HARQ-ACK information may be transmitted by at least one of the above-described method 2-1-1 or method 2-1-2 of FIG. 6 . When the transmission period is less than 1 slot, the UE may transmit HARQ-ACK information for DCI information indicating SPS PDSCH deactivation by at least one of Method 2-2-1 to Method 2-2-5 . The descriptions described above in FIG. 7 are operations applied when the terminal has previously set the semi-static HARQ-ACK codebook from the base station as a higher-order signal. In addition, the descriptions described above with reference to FIG. 7 may be limited to a case in which the terminal is set in advance to enable only one HARQ-ACK transmission per slot by a higher signal or standard or terminal capability.

8 is a block diagram illustrating a method for a UE to determine a dynamic HARQ-ACK codebook for SPS PDSCH reception according to an embodiment of the present disclosure.

Referring to FIG. 8, when the terminal is previously set to operate as a dynamic HARQ-ACK codebook with a higher-order signal, the terminal starts determining the size of the HARQ-ACK codebook for HARQ-ACK information to be transmitted in a specific slot (800). . The UE not only determines the size of the HARQ-ACK codebook for the dynamically scheduled PDSCH, but also calculates the total number of SPS PDSCHs generated in the slot corresponding to the slot in which the HARQ-ACK information is to be transmitted, and reflects this in the HARQ-ACK codebook size (802) do. It may be possible for the UE to set the dynamic HARQ-ACK codebook by at least one of [pseudo-code 3] or [pseudo-code 4] described above in FIG. 6 . Thereafter, the UE terminates determining the size of the HARQ-ACK codebook (804), and transmits HARQ-ACK information in the corresponding slot. In addition, the descriptions described above in FIG. 8 may be limited to a case in which the terminal is set in advance to enable only one HARQ-ACK transmission per slot with a higher signal or standard or terminal capability. For reference, when one SPS PDSCH is repeatedly transmitted across slot boundaries as in 650 of FIG. 6 , when determining the dynamic HARQ-ACK codebook, the UE determines the HARQ-ACK codebook size based on the last repeated transmission slot of the SPS PDSCH. to decide Specifically, in the case of slot k in FIG. 6 , the SPS PDSCH 652 is transmitted, but instead of counting as the number of valid SPS PDSCHs to determine the dynamic HARQ-ACK codebook size, the SPS transmitted in slot k+1 For the PDSCH 654, the UE determines the dynamic HARQ-ACK codebook size. In addition, when determining the value of the number of SPS PDSCHs per slot (k) for dynamic HARQ-ACK codebook size determination in a specific slot in [pseudo-code 4], the effective number of SPS PDSCHs is the last SPS PDSCH among the repeatedly transmitted SPS PDSCHs. The slot (or end slot) to which the end symbol belongs is calculated from the corresponding slot.

9 is a block diagram illustrating a method of transmitting HARQ-ACK information according to a DL SPS transmission period of a UE according to an embodiment of the present disclosure.

Referring to FIG. 9 , the UE may receive information on setting the maximum number of HARQ-ACK information transmission per DL SPS transmission period or slot through an upper level signal or an L1 signal ( 900 ).

In addition, the UE may check the DL SPS transmission period and the HARQ-ACK information transmission condition per slot ( 902 ).

When condition 1 is satisfied, the terminal may perform the first type of HARQ-ACK information transmission (904).

When condition 2 is satisfied, the UE may perform the second type of HARQ-ACK information transmission ( 906 ).

Condition 1 may be equal to at least one of the following.

- When the transmission period of the DL SPS PDSCH is greater than 1 slot

- When only one HARQ-ACK transmission is possible per slot

Condition 2 may be equal to at least one of the following.

- When the transmission period of the DL SPS PDSCH is less than 1 slot

- When two or more HARQ-ACK transmissions are possible per slot

The above-described first type HARQ-ACK information transmission may include the following field in the DCI format indicating activation of the DL SPS PDSCH.

- PDSCH to HARQ-ACK feedback timing indicator: may indicate a slot in which the PDSCH is transmitted and a slot interval in which HARQ-ACK information is transmitted in units of slots. When one SPS PDSCH is repeatedly transmitted across a slot boundary as shown in 650 of FIG. 6 , the reference of a slot in which the PDSCH is transmitted is the slot of the last repeatedly transmitted SPS PDSCH.

- PUCCH resource indicator: number of symbols, start symbol, PRB index, PUCCH format, etc.

The PUCCH transmission resource and transmission format in which the HARQ-ACK information for the DL SPS PDSCH will be transmitted can be set to the UE through the above information. In addition, a set of the two field values may be set as a higher-order signal in advance, and one set may be selected based on DCI.

The above-described second type HARQ-ACK information transmission may include the following field in the DCI format indicating activation of the DL SPS PDSCH.

- PDSCH to HARQ-ACK feedback timing indicator: indicates the end symbol of the PDSCH and the start symbol interval at which HARQ-ACK information is transmitted in symbol units

- PUCCH resource indicator: number of symbols, PRB index, PUCCH format, etc.

The PUCCH transmission resource and transmission format in which the HARQ-ACK information for the DL SPS PDSCH will be transmitted can be set to the UE through the above information. In addition, a set of the two field values may be set as a higher-order signal in advance, and one set may be selected based on DCI.

Example 4 DL SPS reception in time overlapping situation

10 is a diagram illustrating a DL SPS reception operation of a UE in a situation in which two or more DL SPSs overlap in time resources according to an embodiment of the present disclosure.

Although the present disclosure is described in relation to DL SPS reception, it is equally applicable to UL SPS. When applied to UL SPS, the base station may perform configuration information transmission and activation by DCI, but operations related to TB reception in a situation overlapped in time resources may be performed by the base station, not the terminal.

Although the description of the DL SPS has been described in the present invention, section 10.2 of 3GPP standard TS38.213, section 5.3 of TS38.321, and section 6.3.2 of TS38.331 are cited.

Referring to FIG. 10 , it is possible for the terminal to receive two or more different DL SPS higher-order signal configuration information within one activated BWP and activate it. In Rel-16 NR, it is possible to set up to 8 DL SPS in one BWP. The present invention is not limited thereto and can be applied to 8 or more DL SPS settings within the BWP. Different DL SPS PDSCHs (hereinafter, DL SPS will be described) may be classified by index information set/indicated by a higher-order signal or an L1 signal in advance.

For example, the index information may be directly (explicitly) included in the configuration information transmitted as a higher-order signal. The configuration information may include at least one of periodicity, nrofHARQ-Processes, n1PUCCH-AN, and mcs-Table information for each DL SPS configuration. Also, index information for identifying each DL SPS may be included.

As another example, the index information may be included in control information transmitted through an upper signal and/or an L1 signal. As another example, the index information may be set indirectly (implicitly). The index information may be set to increase sequentially in the order in which the DL SPS configuration information is included in the configuration information transmitted as a higher-order signal.

As another example, after the upper setting, the index information may be set to increase sequentially in the order activated by the control information transmitted through the L1 signal. If a plurality of DL SPSs are activated in the control information, the index information may be set to increase in the order included in the upper signal.

In addition, the UE may generate a situation in which two or more activated different DL SPS resources partially overlap in terms of time resources. Here, activation may refer to a state set by a higher-order signal, a state actually operated by an L1 message after setting, or both. In addition, the time resource may be set or allocated as information included in the higher-order signal, or may be configured or allocated using information included in the L1 message or transmission time of the L1 message.

For example, referring to FIG. 10 , when two or more DL SPS resources have different transmission periods, time resource overlap may occur between different DL SPS resources within a specific transmission interval or slot.

1001 of FIG. 10 shows a situation in which three different DL SPS resources are overlapped in time resources. If the UE can receive only one DL SPS resource at a time, the UE receives only one DL SPS resource among the overlapped DL SPS resources. Therefore, there may be a method for the UE to arbitrarily select one of the overlapping DL SPS resources, but from the viewpoint of the base station, the UE does not know which DL SPS of the overlapped DL SPS resources has been received and has transmitted HARQ-ACK information. Therefore, a method for selecting a DL SPS resource predefined between the base station and the terminal is required. In order to solve this problem, at least one or a plurality of methods among the following methods may be applied in combination.

- Method 3-1: This is a method in which the DL SPS resource having the lowest index among the time-overlapping DL SPS resources is prioritized. For example, when a DL SPS resource having an index value of 1 and a DL SPS resource having an index value of 3 overlap each other, the UE transmits the transport block (TB) from the base station through the DL SPS resource having an index value of 1. ), and does not receive a transport block through a DL SPS resource having an index value of 3. Accordingly, the UE demodulates/decodes the TB received through the DL SPS resource having an index value of 1 and transmits HARQ-ACK information thereto through the PUCCH resource preset for the DL SPS resource. .

Even in a situation where three or more DL SPSs overlap in time, the UE may receive the TB transmitted through the DL SPS resource having the lowest index value. As another example, in a situation in which DL SPS resources overlap in time, it is assumed that the UE does not receive the TB transmitted through the DL SPS resource except for the DL SPS resource having the lowest index value, or the base station does not transmit the TB through the resource. so it can work. As an example, the UE may not perform demodulation/decoding operation on the corresponding DL SPS resource. As another example, the UE may not transmit feedback information on the corresponding DL SPS resource, for example, Ack/Nack information.

- Method 3-2: This is a method in which the DL SPS resource having the highest index among the time-overlapping DL SPS resources is prioritized. For example, when a DL SPS resource having an index value of 1 and a DL SPS resource having an index value of 3 overlap each other, the UE transmits the transport block (TB) from the base station through the DL SPS resource having an index value of 3 ), and the DL SPS resource having an index value of 1 is not received. Therefore, the UE demodulates/decodes the TB received through the DL SPS resource having an index value of 3 and transmits HARQ-ACK information for this through the PUCCH resource preset for the DL SPS resource. .

Even in a situation where three or more DL SPSs overlap in time, the UE may receive a TB transmitted through the DL SPS resource having the highest index value. As another example, in a time-overlapping situation, the UE does not receive the TB transmitted through the DL SPS resource except for the DL SPS resource having the highest index value, or the base station assumes that the TB will not be transmitted through the resource. have. As an example, the UE may not perform demodulation/decoding operation on the corresponding DL SPS resource. As another example, the UE may not transmit feedback information on the corresponding DL SPS resource, for example, Ack/Nack information.

- Method 3-3: In addition to Method 3-1 (or Method 3-2), it is a method of prioritizing DL SPS resources in chronological order. In other words, it is a method in which the DL SPS resource, which has already been determined to have a low priority in the resource priority determination through index comparison, is excluded from the priority determination according to overlap with other resources. In this case, the resource priority determination may be sequentially performed in chronological order (or in reverse chronological order within a specific time region). Here, the specific time domain may be a specific transmission interval or slot.

Specifically, the UE determines whether the resources of the DL SPS overlap with the resources of other DL SPSs in chronological order. If overlap occurs, the UE may assume that it will not receive a reception operation on a DL SPS resource having a low priority through index comparison or that the eNB does not transmit a TB. In addition, the UE may exclude the DL SPS of low priority in which the overlap occurs in the time resource from the operation of determining whether the overlap is thereafter.

1001 of FIG. 10 shows a situation in which three DL SPSs overlap each other differently. If the index value set in the DL SPS 1000 is 1, the index value set in the DL SPS 1002 is 3, and the index value set in the DL SPS 1004 is 5, according to method 3-1, the terminal The terminal does not receive the DL SPS 1004 because the index value is higher than that of the DL SPS 1002 , and the terminal does not receive the DL SPS 1002 because the index value is higher than that of the DL SPS 1000 . Accordingly, in the situation 1001 of FIG. 10 , the UE will receive only the DL SPS 1000 by the method 3-1, even though the DL SPS 1000 and the DL SPS 1004 do not overlap each other in time. As in Method 3-1, in a situation in which the smaller the index value, the higher the priority, the operation of prioritizing the DL SPS resource using only the resource and the index information for which the DL SPS is configured and receiving the DL SPS having a higher priority by the UE is inefficient. can be

In order to solve this problem, Method 3-3 determines whether or not time overlaps with other valid DL SPSs at the point in time when the UE actually receives the DL SPS. A DL SPS having a low priority may be excluded from whether the time overlap is determined. Thereafter, the UE performs an operation of determining whether to overlap with respect to DL SPS(s) that are not excluded from determining whether to overlap the DL SPS time. Specifically, the following [Table 9] method may be applied.

[Table 9]

The above method will be described with reference to 1001 of FIG. 10 . If the index value set in the DL SPS 1000 is 1, the index value set in the DL SPS 1002 is 3, and the index value set in the DL SPS 1004 is 5, the terminal in Operation 1 is a specific transmission interval or All DL SPS resources 1000, 1002, and 1004 activated in the slot are determined as valid DL SPS resources. And in Operation 2, the UE will determine whether other overlapping DL SPS(s) exist before receiving the DL SPS 1000 scheduled first in chronological order. Since the DL SPS 1000 overlaps with the DL SPS 1002, in Operation 4, the UE receives the DL SPS 1000 with a high priority (with an index value of 1), and a low priority (with an index value of 3) with) DL SPS 1002 is not received. The DL SPS 1000 and the DL SPS 1002 are determined to be invalid DL SPSs, and the UE moves to Operation 1 to check the next existing DL SPS 1004 first. In operation 2, it is determined whether there are valid DL SPS resources overlapping with the DL SPS 1004. Since the DL SPS 1002 is no longer valid DL SPS resources, the UE determines that there is no overlapping resource and moves to Operation 3. And the terminal receives the DL SPS (1004). Method 3-2 can also be applied in the same way. In addition, in [Table 9], if the operations are applied in consideration of the chronological order of the DL SPS, a method of performing the DL SPS in the reverse order is also possible.

- Method 3-4: In addition to method 3-1 (or method 3-2), it is a method of determining priority in consideration of the time resource allocated to the DL SPS. In other words, it is a method in which the DL SPS resource, which has already been determined to have a low priority in the resource priority determination through index comparison, is excluded from the priority determination according to overlap with other resources. In this case, the determination of resource priority may be sequentially performed from a DL SPS having a low index (or a DL SPS having a high index) within a specific time domain. Here, the specific time domain may be a specific transmission interval or slot.

Specifically, it is determined whether the resources of the DL SPS overlap with the resources of other DL SPSs in the ascending order of the index within a specific time domain. If overlap occurs, the UE may assume that it will not receive a reception operation on a DL SPS resource having a low priority through index comparison or that the eNB does not transmit a TB. In addition, the UE may exclude the DL SPS of low priority in which the overlap occurs in the time resource from the operation of determining whether the overlap is thereafter.

Considering method 3-3, in 1001 of FIG. 10, if the index value set in the DL SPS 1000 is 5, the index value set in the DL SPS 1002 is 3, and the index value set in the DL SPS 1004 is 1, the UE does not receive the DL SPS 1004, the DL SPS 1002 overlaps the DL SPS 1004, and the UE receives the DL SPS 1004 even though the priority is low. Therefore, considering chronological order can be problematic. Accordingly, the UE excludes DL SPSs that overlap at least one symbol in terms of time resources with the DL SPS (A) having the highest priority in consideration of the time resource region to which all DL SPSs activated within a specific transmission interval or slot are allocated. and may determine the reception of the DL SPS (A) of the highest priority. In addition, the UE excludes DL SPSs that overlap at least one symbol in terms of time resources with the DL SPS (B) resource having the highest priority among the remaining DL SPS resources that are not excluded, and may determine reception of the DL SPS (B). . In addition, the UE may continue to perform this operation until there are no DL SPSs that are not determined to be received or excluded. In addition, data may be received for the DL SPSs determined within the specific interval or slot, and HARQ-ACK information may be transmitted to the base station. Alternatively, a method such as the following [Table 10] may be applied.

[Table 10]

A more detailed description will be given with reference to 1011 of FIG. 10 . Referring to 1011, it shows a situation in which DL SPSs 1010, 1012, 1014, 1016, 1018, and 1020 having six different indices are activated and scheduled in one slot. When the DL SPS having a low index value has a high priority, according to Method 3-4, the UE receives the DL SPS 1010 of the index 1 and does not receive the DL SPS 1018 of the index 6 overlapping it. Then, the UE receives the DL SPS 1016 of the index 2 having a higher priority, and does not receive the DL SPS 1014 of the index 3 and the DL SPS 1020 of the index 4 overlapping them. Then, the terminal receives the DL SPS 1012 of index 5 having a higher priority. Therefore, the terminal finally receives the DL SPS (1010, 1012, 1016) and reports HARQ-ACK information thereto to the base station after demodulation/decoding.

- Method 3-5: Method 3-3 or Method 3-4 is a method of determining a priority by considering symbol direction information within a specific transmission interval or slot in a TDD situation. Here, the symbol direction may be one of downlink, uplink, and flexible. For a method of indicating symbol direction information in a TDD situation, refer to section 11.1 of 3GPP standard TS 38.213. Basically, the UE can receive data only when the resource region to which the DL SPS is allocated is higher or all symbols are indicated as downlink (DL) by the L1 signal. Alternatively, when at least one symbol among the resources to which the DL SPS is allocated is set/indicated as an uplink symbol or a flexible symbol by an upper or L1 signal, the UE may not receive the DL SPS. Accordingly, it may be possible to consider Method 3-3 or Method 3-4 in consideration of this. In the case of Method 3-3 [Table 9], the following conditions may be added.

- Only when the transmission resources of DL SPSs are all indicated in the downlink by the upper level or L1 signal, they are regarded as valid DL SPS resources. Alternatively, DL SPS resources in which at least one symbol overlaps with a symbol set/indicated as an uplink symbol or a flexible symbol by an upper or L1 signal is considered invalid and the UE does not receive the DL SPS resources. In 1001 of FIG. 10 , since the DL SPS 1004 overlaps the symbol 1006 set/indicated as an uplink symbol or a flexible symbol by an upper or L1 signal, the UE does not receive it.

In other words, it is determined whether each DL SPS resource overlaps an uplink symbol or a flexible symbol before performing Method 3-3. The terminal operates on the assumption that non-received and the base station does not transmit a TB in the overlapping DL SPS resource. Thereafter, in performing Method 3-3, the corresponding DL SPS is performed after excluding it from the determination of priority.

In the case of Method 3-4, the following conditions may be added in [Table 10].

- The UE determines not to receive DL SPS resources in which at least one symbol overlaps with a symbol set/indicated as an uplink symbol or a flexible symbol by an upper or L1 signal. In 1011 of FIG. 10 , the DL SPSs 1016 and 1020 overlap the symbol 1019 set/indicated as an uplink or flexible symbol by an upper or L1 signal, so the UE may not receive the DL SPSs 1016 and 1020. have. Accordingly, in this case, the UE receives the DL SPSs 1010 , 1012 , and 1014 according to Method 3-4 and reports HARQ-ACK information for them. The UE does not receive the DL SPS (1018, 1016, 1020) according to Method 3-4 and Method 3-5.

In other words, before performing Method 3-4, it is determined whether each DL SPS resource overlaps an uplink symbol or a flexible symbol. The UE operates on the assumption that it is not received or that the base station does not transmit a TB in the overlapping DL SPS resource. Thereafter, in performing Method 3-4, the DL SPS is performed after excluding it from determining whether or not to prioritize.

11 is a block diagram illustrating a reception operation of a UE in a situation in which two or more DL SPSs overlap in time resources according to an embodiment of the present disclosure.

Referring to FIG. 11 , the UE may receive DL SPS configuration information as a higher-order signal (RRC) in advance ( 1100 ). In this case, the UE may receive the index information on the DL SPS together or the index information on the DL SPS may be indirectly configured.

In addition, DL SPS information set higher by DCI including CRC scrambled with CS-RNTI may be activated individually or as a group ( 1100 ). Here, the DL SPS may be activated only by receiving the configuration information of the upper signal, and in this case, the DCI reception including the CRC scrambled with the CS-RNTI may be omitted.

The terminal periodically receives information from a resource set in advance through each DL SPS configuration information. If two or more DL SPSs having different indices overlap in time, the UE may consider or perform at least one of the methods (methods 3-1 to 3-5) described above in FIG. 10 ( 1102 ). . And accordingly, the UE may receive only the DL SPS having a high priority (eg, the lowest index value) and report HARQ-ACK information for the DL SPS ( 1104 ). Other than that, the UE does not receive DL SPSs with low priority (eg, high index value) and does not report HARQ-ACK information or generate HARQ-ACK information itself. When the UE receives two or more DL SPS resources in one slot, the UE can use one of the following two methods when configuring the HARQ-ACK codebook.

- Method 4-1: The UE may sequentially map HARQ-ACK information for the DL SPS resource having the lowest index. For example, when the terminal receives the DL SPS of index 1, the DL SPS of index 3, and the DL SPS of index 5 in one slot, the terminal transmits the HARQ-ACK codebook [HARQ-ACK information for DL SPS index 1, HARQ-ACK information for DL SPS index 3, HARQ-ACK information for DL SPS index 5].

- Method 4-2: The UE may sequentially map HARQ-ACK information for the DL SPS received earlier in consideration of the time resource region of the DL SPSs actually received by the UE in the slot. For example, when the UE receives the DL SPS of index 1 in symbols 1-3, DL SPS symbols 10-11 of index 3, and DL SPS symbols 4-6 of index 5, the SPS PDSCH is actually transmitted/received time From a resource point of view, the UE may configure the HARQ-ACK codebook as [HARQ-ACK information for DL SPS index 1, HARQ-ACK information for DL SPS index 5, HARQ-ACK information for DL SPS index 3]. Alternatively, the UE uses an applied time domain resource allocation (TDRA) value when activating the DL SPS. That is, for DL SPSs received in one slot, the UE generates a HARQ-ACK codebook with reference to 9.1.2 of 3GPP standard TS 38.213 for TDRA values for the DL SPSs.

12 is a block diagram illustrating the structure of a terminal capable of performing an embodiment of the present disclosure.

Referring to FIG. 12 , the terminal of the present invention may include a terminal receiving unit 1200 , a terminal transmitting unit 1204 , and a terminal processing unit 1202 . The terminal receiving unit 1200 and the terminal transmitting unit 1204 may be collectively referred to as a transceiver in the embodiment. The transceiver may transmit/receive a signal to/from the base station. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal. In addition, the transceiver may receive a signal through a wireless channel and output it to the terminal processing unit 1202 , and transmit the signal output from the terminal processing unit 1202 through a wireless channel. The terminal processing unit 1202 may control a series of processes so that the terminal can operate according to the above-described embodiment.

13 is a block diagram illustrating a structure of a base station capable of performing an embodiment of the present disclosure.

Referring to FIG. 13 , in the embodiment, the base station may include at least one of a base station receiving unit 1301 , a base station transmitting unit 1305 , and a base station processing unit 1303 . The base station receiving unit 1301 and the base station transmitting unit 1305 may be collectively referred to as a transceiver in the embodiment of the present invention. The transceiver may transmit/receive a signal to/from the terminal. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal. In addition, the transceiver may receive a signal through a wireless channel and output it to the base station processing unit 1303 , and transmit the signal output from the base station processing unit 1303 through the wireless channel. The base station processing unit 1303 may control a series of processes so that the base station can operate according to the above-described embodiment of the present invention.

On the other hand, in the drawings for explaining the method of the present invention, the order of description does not necessarily correspond to the order of execution, and the precedence relationship may be changed or may be executed in parallel. Alternatively, some components may be omitted and only some components may be included in the drawings for explaining the method of the present invention without impairing the essence of the present invention.

Although the present disclosure has mainly described the UE operation for the SPS PDSCH, it may be sufficiently applicable to equally apply to the grant-free PUSCH (or configured grant type 1 and type 2).

In addition, the method of the present invention may be implemented in a combination of some or all of the contents included in each embodiment within a range that does not impair the essence of the invention.

On the other hand, the embodiments of the present invention disclosed in the present specification and drawings are merely presented as specific examples to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention. That is, it will be apparent to those of ordinary skill in the art to which the present invention pertains that other modified examples can be implemented based on the technical spirit of the present invention. In addition, each of the above embodiments may be operated in combination with each other as needed. For example, a base station and a terminal may be operated by combining parts of a plurality of embodiments of the present invention. In addition, although the above embodiments have been presented based on the NR system, other modifications based on the technical idea of the embodiment may be implemented in other systems such as FDD or TDD LTE systems.

While this disclosure has been shown and described with reference to various embodiments thereof, it will be appreciated by those skilled in the art that various changes in form and detail may be defined by the appended claims and their equivalents without departing from the spirit and scope of the following disclosure. can be understood by

Claims (15)

A method performed by a terminal in a communication system, comprising:
Receiving an SPS configuration including a semi persistent scheduling (SPS) configuration index from the base station;
identifying at least one physical downlink shared channel (PDSCH) corresponding to the SPS configuration;
checking the PDSCH having the smallest SPS configuration index when the at least one PDSCH corresponding to the SPS configuration overlaps in time within a slot;
determining a PDSCH for data transmission based on excluding a PDSCH overlapping the PDSCH having the smallest SPS configuration index from the at least one PDSCH; and
Receiving data based on the determined PDSCH,
The at least one PDSCH does not overlap a symbol indicated by an uplink in the slot. According to claim 1,
The SPS configuration comprises at least one of a period, a number of hybrid automatic repeat request (HARQ) processes, a HARQ resource for a PUCCH for a downlink SPS, or a modulation and coding scheme (MCS) table. According to claim 1,
The method further comprising the step of transmitting HARQ information for the PDSCH for data transmission among the at least one PDSCH to the base station. According to claim 1,
Further comprising the step of receiving DCI (downlink control information) including SPS activation information from the base station,
The method, characterized in that the SPS configuration is received through higher layer signaling. A method performed by a base station in a communication system, comprising:
Transmitting the SPS configuration including the SPS (semi persistent scheduling) configuration index to the terminal; and
Receiving data from the terminal based on a physical downlink shared channel (PDSCH) for data transmission,
The PDSCH for the data transmission includes a PDSCH having the smallest SPS configuration index,
The PDSCH overlapping the PDSCH having the smallest SPS configuration index is excluded from at least one PDSCH corresponding to the SPS configuration, and
The at least one PDSCH does not overlap a symbol indicated by an uplink in a slot. 6. The method of claim 5,
The SPS configuration comprises at least one of a period, a number of hybrid automatic repeat request (HARQ) processes, a HARQ resource for a PUCCH for a downlink SPS, or a modulation and coding scheme (MCS) table. 6. The method of claim 5,
The method further comprising the step of receiving HARQ information for the PDSCH for data transmission among the at least one PDSCH from the terminal. 7. The method of claim 6,
Further comprising the step of transmitting DCI (downlink control information) including SPS activation information to the terminal,
The method, characterized in that the SPS configuration is transmitted through higher layer signaling. In a terminal in a communication system,
transceiver; and
connected to the transceiver,
Receive the SPS configuration including the SPS (semi persistent scheduling) configuration index from the base station,
Check at least one physical downlink shared channel (PDSCH) corresponding to the SPS configuration,
If the at least one PDSCH corresponding to the SPS configuration overlaps in time within the slot, check the PDSCH having the smallest SPS configuration index,
Determining a PDSCH for data transmission based on excluding a PDSCH overlapping the PDSCH having the smallest SPS configuration index from the at least one PDSCH,
A control unit for receiving data based on the determined PDSCH,
The at least one PDSCH does not overlap a symbol indicated by an uplink in the slot. 10. The method of claim 9,
The SPS configuration includes at least one of a period, a number of hybrid automatic repeat request (HARQ) processes, a HARQ resource for a PUCCH for a downlink SPS, or a modulation and coding scheme (MCS) table. 10. The method of claim 9,
The control unit is
The terminal, characterized in that for transmitting HARQ information for the PDSCH for data transmission among the at least one PDSCH to the base station. 10. The method of claim 9,
The control unit is
Receiving downlink control information (DCI) including SPS activation information from the base station,
The SPS configuration is a terminal, characterized in that received through higher layer signaling. In a base station in a communication system,
transceiver; and
connected to the transceiver,
Transmits the SPS setting including the SPS (semi persistent scheduling) setting index to the terminal,
A control unit for receiving data from the terminal based on a physical downlink shared channel (PDSCH) for data transmission,
The PDSCH for the data transmission includes a PDSCH having the smallest SPS configuration index,
The PDSCH overlapping the PDSCH having the smallest SPS configuration index is excluded from at least one PDSCH corresponding to the SPS configuration, and
The at least one PDSCH does not overlap a symbol indicated by an uplink in a slot. 14. The method of claim 13,
The SPS configuration includes at least one of a period, a number of hybrid automatic repeat request (HARQ) processes, a HARQ resource for a PUCCH for a downlink SPS, or a modulation and coding scheme (MCS) table. 14. The method of claim 13,
The control unit is
Transmitting DCI (downlink control information) including SPS activation information to the terminal,
Receive HARQ information for the PDSCH for data transmission among the at least one PDSCH from the terminal,
The base station, characterized in that the SPS configuration is received through higher layer signaling.

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